4: 防爆电器温度组别T2对应的温度上升限度是（ ）。A. 300℃ B. 200℃ C. 120℃ D. 70℃ A: 300℃ B: 200℃ C: 120℃ D: 70℃ ...

3: 以下检测方法中属于非接触式检测的是（ ）。 A: 超声检测 B: 射线检测 C: 磁粉检测 D: 红外检测 ...

6: 测量过程中设备没有调零造成的误差属于（ ）。 A: 系统误差 B: 随机误差 C: 粗大误差 D: 人员误差 ...

12: 通过练习逐步形成安全技能，练习成绩进步的一般规律为（ ）。 A: 跳跃现象 B: 进步先快后慢 C: 反复现象 D: 高原现象 E: 起伏现象 ...

12: 常见的导致非理智行为的心理原因有（ ）等。 A: 侥幸心理 B: 省能心理 C: 自卫心理 D: 逆反心理 E: 凑兴心理 ...

31: One Sunday morning, I decided to buy a computer to use for school. I went to the biggest store in town, which sold all kinds of computers. There were so many computers there that I didn’t know how to choose a right one. “Hi...

10: ________Iclosethewindow?It'ssocoldhere. A: Will B: Do C: Would D: Shall ...

31: Everyone has got two personalities (性格) — the one that is shown to the world and the other that is secret and real. You don't show your secret personality when you're awake because you can control yourself, but when you're asle...

15: Theheadmaster________formorethantwoweeks.　 A: has left B: has gone C: has been away D: has come back ...

33: Why do you think people who live in some hot countries eat very spicy(辛辣的)food? Is it because the spices make the food taste better? Is it just because their parents and grandparents and great-grandparents liked hot food，or is ther...