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【判断题】
在制冷系统抽真空时,在真空值达到规定要求时,还应继续抽15-30mn。A.
正确
B.
错误
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【单选题】听力原文：M: You look so excited, what happened to you. W: I will go to Europe on business, you know it's my fist time to get there. M: When is it that you are leaving? W: In just four weeks, and I am exci...
A.
To renew her passport.
B.
To make out the route.
C.
To book the tickets.
D.
To subtle his apartment.
【单选题】听力原文：M: Look! I'm sorry to bother you about this, but could you turn that music down? W: Sorry, I didn't realize you could hear it. What will the woman probably do?
A.
Look at something for the man.
B.
Stop talking so much.
C.
Play the music more quietly.
D.
Pay more attention to the music.
【单选题】如图所示,A、B、C三个小球质量相等,A小球竖直上抛,B小球沿光滑斜面上滑,C小球以 角做斜上抛运动.若三个小球初速度大小相等,且开始都处于同一水平面上,斜面足够长,则( ).
A.
小球A上升得最高
B.
小球A、B上升得一样高,小球C上升得较低
C.
小球B、C上升得一样高
D.
三个小球上升得一样高
【单选题】如图所示,斜面上 a 、 b 、 c 三点等距,小球从 a 点正上方 O 点抛出,做初速为 v 0 的平抛运动,恰落在 b 点。若小球初速变为 v ,其落点位于 c ,则( )
A.
v0＜v＜2v0
B.
v＝2v0
C.
2v0＜v＜3v0
D.
v＞3v0
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