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【简答题】
在煤的灰分测定实验中,从炉中取出灰皿,放在____或____上,在空气中冷却5min左右,移入____中冷却至室温(约20min)后,称量。
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【判断题】To stay
at home safe, you needn’t have to make sure the spare key is difficult for a
potential intruder to find.
A.
正确
B.
错误
【简答题】There is a lot of wind today. It is today.
【简答题】To stay safe
at home, ( )A. Have
emergency numbers easily accessible. B. Install an alarm system. C. Never
tell someone that you’re home alone. D. Don’t go
into the house if it looks like it's been...
【单选题】2 I don’t think you need to stay at home. You’ve just got a cold—it’s not life-threatening !
A.
to keep away from
B.
to act in a way which is not safe
C.
to be knocked over by the wind
D.
to think non-stop about one thing
E.
of an illness or condition which could kill you
【单选题】关于扭转外力偶下列说法不正确的是
A.
扭转外力偶绕杆的轴线，作用面与横截面平行
B.
可以由传动轴的传递功率和转数计算扭转外力偶矩的大小
C.
可以通过力对轴的矩计算扭转外力偶矩的大小
D.
扭转外力偶矩的正负号是按指向规定的
【单选题】—How terrible it is today! — . A very bad day for swimming, isn't it?
A.
So it is
B.
So is it
C.
Nor it is
D.
Nor is it
【简答题】There is a lot of cloud today. It is today.
【单选题】Firms that stay at home to play it safe ________.
A.
protect themselves from competition at home
B.
gain a competitive edge against imports in their home markets
C.
successfully shield themselves from foreign competition
D.
risk losing their home markets
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