- A.<img src="//img1.yqda.net/question-name/cf/524dbe0a24324ef82a79accdb9ddef.jpg" alt="" border="0" />
- B.<img src="//img1.yqda.net/question-name/78/59fe52e5c2c9ea943521b534f4b1e5.jpg" alt="" border="0" />
- C.<img src="//img1.yqda.net/question-name/4b/1ce5c25e381701760a7dca16b62e5a.jpg" alt="" border="0" />
- D.<img src="//img1.yqda.net/question-name/f6/d9992339f804b050c376b85ad5afa9.jpg" alt="" border="0" />
- A.<img src="//img1.yqda.net/question-name/2e/4712bb4466ac6f40d02feeecb8d393.jpg" alt="" border="0" />
- B.<img src="//img1.yqda.net/question-name/16/899b479c42d4c5196d64e373d2c0a2.jpg" alt="" border="0" />
- C. 溴水
- D.<img src="//img1.yqda.net/question-name/cf/4f9ff8201186f8afcd2e5b871989a7.jpg" alt="" border="0" />
- A. 重力做正功,拉为做负功,合力做功为零
- B. 重力做负功,拉力做正功,合力做正功
- C. 重力做负功,拉力做正功,合力做功为零
- D. 重力不做功,拉力做正功,合力做正功
- A. 20 cm长的结实的细绳、小木球、秒表、米尺
- B. 110cm长的结实的细线、小钢球、秒表、米尺
- C. 100 cm长的结实的细线、小木球、秒表、米尺
- D. 100 cm长的结实的细线、大钢球、大挂钟、米尺
- A.<img src="//img1.yqda.net/question-name/b1/3a840f1cea8edbe8629593ebe39416.gif" alt="" border="0" />
- B.<img src="//img1.yqda.net/question-name/94/a0f196ab0e6476c973d8c43d21ef29.gif" alt="" border="0" />
- C.<img src="//img1.yqda.net/question-name/3f/d38bd43b3726788f8974a8f227ac35.gif" alt="" border="0" />
- D.<img src="//img1.yqda.net/question-name/48/732007314335baf987b727258886eb.gif" alt="" border="0" />
- A. 重水
- B. 溴水
- C. 王水
- D. 氨水
- A.<img src="//img1.yqda.net/question-name/37/962b05bbd7fa48ef6a1ffb0d98a22f.jpg" alt="" border="0" />
- B.<img src="//img1.yqda.net/question-name/2b/8ff5981ecde9bd46f9370ef3509b6a.jpg" alt="" border="0" />
- C.<img src="//img1.yqda.net/question-name/de/d3b63a1dd3464e9c425112342e5973.jpg" alt="" border="0" />
- D.<img src="//img1.yqda.net/question-name/15/7c4741f6496a94de4170c4c14c9d1e.jpg" alt="" border="0" />
- A. 氧气的摩尔质量和氧分子的体积
- B. 氧分子的质量和氧分子的体积
- C. 氧分子的质量和氧气的摩尔质量
- D. 氧气的密度和氧气的摩尔质量
- A.<img src="//img1.yqda.net/question-name/b0/dcd01b82e7df921c4fd3de77b92e7d.jpg" alt="" border="0" />
- B.<img src="//img1.yqda.net/question-name/f6/5d0dcd2d4f7e2752bcab45897e3061.jpg" alt="" border="0" />
- C.<img src="//img1.yqda.net/question-name/0c/27a9caf55ae364d93484d437d1355b.jpg" alt="" border="0" />
- D.<img src="//img1.yqda.net/question-name/5f/a9ef05860e8690bacbc35534d00d41.jpg" alt="" border="0" />
- A. 在光滑的水平面上两球发生正碰
- B. 车原来静止在光滑的水平面上,车上的人从车头走到车尾
- C. 水平放置的弹簧一端固定,另一端与置于光滑水平面上的物体相连,令弹簧伸长,使物体运动
- D. 火箭的反冲运动
- A. 甲烷
- B. 2,2-二甲基丙烷
- C. 正丁烷
- D. 2-甲基丁烷
- A.<img src="//img1.yqda.net/question-name/3c/89e5ff8787ed2442454e5e32f5fa01.jpg" alt="" border="0" />
- B.<img src="//img1.yqda.net/question-name/16/f5efb1deb9ea530c1fecddac58e04f.jpg" alt="" border="0" />
- C.<img src="//img1.yqda.net/question-name/03/4831dcbba0965df270a5f333dc7a54.jpg" alt="" border="0" />
- D.<img src="//img1.yqda.net/question-name/2f/e0cc17d546e4fd9bc5b5f03c4d6b68.jpg" alt="" border="0" />
- A.<img src="//img1.yqda.net/question-name/b1/b9f5bfa775cfd53fe76b6e3c393b40.jpg" alt="" border="0" />
- B.<img src="//img1.yqda.net/question-name/8a/88f5ed8ebe2d47dff8b56f0961ff59.jpg" alt="" border="0" />
- C.<img src="//img1.yqda.net/question-name/4c/ecd142545ed1949ffdd4bc32e16abf.jpg" alt="" border="0" />
- D.<img src="//img1.yqda.net/question-name/a1/3122f8c786384f7058503c9cdd3df2.jpg" alt="" border="0" />