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【判断题】
细胞周期并不总是完整的,有时会缺乏某一时相。A.
正确
B.
错误
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举一反三
【多选题】观察图1-2液压千斤顶工作原理图,设作用在小活塞上的力是F、作用在大活塞上的重物重量为G,小活塞和大活塞的作用面积分别是A 1 、A 2 ,小活塞与大活塞下腔的压力分别是P 1 、P 2 ,选出下面描述正确的选项( )
A.
G=FA 1 /A 2
B.
G=FA 2 /A 1
C.
省力倍数=A 1 /A 2
D.
省力倍数=A 2 /A 1
E.
F/A 1 =G/A 2 =P
【单选题】听力原文：W: Jim, thank goodness, you've arrived, the class presentation started half an hour ago and I was really desperate. M: I am terribly sorry that I'm late, Jane, This morning has been a real mess, ...
A.
Because there was a traffic jam.
B.
Because he got up late.
C.
Because his apartment is far away from the campus.
D.
Because he missed a bus and had to wait for another one.
【单选题】下图为液压千斤顶的工作原理图。P为压力，h为行程，A为活塞面积，则运动关系式为（ )。
A.
A2W=A1F
B.
A1h2=A2h1
C.
A1h1=A2F
D.
A1h1=A2h2
【单选题】下图为液压千斤顶的工作原理图。P为压力，W为负载，A为活塞面积，则（ ）。
A.
W/A1=F/A2
B.
W/F=A2/A1
C.
W/F=A1/A2
D.
W/A2=A1/F
【单选题】— Did your father come back early last night? — Yes. It was not yet eight o'clock ____ he arrived home. [ ]
A.
before
B.
when
C.
that
D.
until
【单选题】---- Did he come back early last night? ---- Yes. It was not yet eight o’clock _______ he arrived home.
A.
when
B.
that
C.
before
D.
until
【多选题】观察图1-2液压千斤顶工作原理图,设作用在小活塞上的力是F、作用在大活塞上的重物重量为G,小活塞和大活塞的作用面积分别是A 1 、A 2 ,小活塞与大活塞下腔的压力分别是P 1 、P 2 ,选出下面描述正确的选项( )
A.
P 1 = F/A 1
B.
P 2 =G/A 2
C.
P 1 =P 2
D.
G=0时,F≠0、P≠0
E.
省力倍数=A 1 /A 2
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