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【单选题】
机械设计本质安全是指机械的设计者，在（ ）采取措施来削除安全隐患的一种机械安全方法。包括在设计中排除危险部件，减少或避免在危险区处理工作需求，提供自动反馈设备并使运动的部件处于密封状态之中等。A.
可行性研究
B.
设计阶段
C.
制造阶段
D.
应用阶段
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举一反三
【单选题】听力原文：M: Hi, Julia. Are you dreaming? W: No, I' m thinking about evening classes. M: Evening classes? Why? W: Because I' m going to study computers. I cannot be a good secretary if I can not use the co...
A.
To dream.
B.
To attend evening classes.
C.
To be a secretary.
【单选题】听力原文：W: Hi, Professor Higgins. M: Hi, Julia. W: [22] Would you be able to help me organize my essay? M: Certainly. What topic have you chosen? W: Women in Politics. M: [23] That topic is very broad. I...
A.
Narrow down the topic of her article.
B.
Read and revise her essay.
C.
Provide some facts for her opinion.
D.
Give her some advice on writing a paper.
【单选题】在 Excel2000 中，设置好小数位数为 3 后， 12345 将显示为 ( ) 。
A.
12345.000
B.
12.345
C.
12345
D.
12,345
【单选题】听力原文：M: Hi, Julia. Glad to see you here. When are you going home today? W: Oh, hi Mike. I have to be here at the library and study until at least eleven o'clock tonight. Are you studying here, too? M:...
A.
Work.
B.
Study.
C.
Eat dinner.
D.
See a movie.
【单选题】下列关于热原的叙述正确的是
A.
180℃3~4h可以彻底破坏热原
B.
热原大小在300~500m之间，可以被微孔滤膜截留
C.
热原能溶于水，超滤装置也不能将其除去
D.
热原不易被吸附
【单选题】A: Hi， Julia. How is everything? B:__________
A.
I don' t care at all.
B.
No good， thanks.
C.
Thank you for asking.
D.
Not bad. How are you?
相关题目：
【单选题】下列关于热原的叙述正确的是
A.
180℃3~4h可以彻底破坏热原
B.
热原大小在300~500m之间，可以被微孔滤膜截留
C.
热原能溶于水，超滤装置也不能将其除去
D.
热原不易被吸附