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【单选题】
朝鲜战争爆发的时间是()A.
1900年1月
B.
1939年6月
C.
1945年8月
D.
1950年6月
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【单选题】He felt a lot better after he the medicine.
A.
take
B.
had taken
C.
have taken
D.
would take
【简答题】The sick child fell into sleep soon after he took the medicine–obviously the medicine was ___ work.
【单选题】重量为G的物体A放在地面上,地面对物体A的作用力为N,物体A对地面的压力N'=G,物体A( )。 A、 B、 C、 D、
A.
相对于G来说既是施力体,又是受力体
B.
只是受力物体
C.
只是施力物体
D.
相对于N来说是受力物体，相对于N'来说,是施力物体
【单选题】Before he to the doctor's, he some medicine .
A.
saw; had bought
B.
went: had taken
C.
had gone: took
D.
saw: bought
【单选题】When the writer talks about two ships and two trains, he is______.
A.
recalling his past experience
B.
expressing his regret over his past time
C.
imagining what might have happened in the past
D.
reminding the reader that we owe our convenience to them
【单选题】一个重量为G的物体，放在光滑的水平地面上，物体对地面的压力为N，地面支承物体的力为N'，（ ）是平衡力。【图片】
A.
G和N
B.
G和N'
C.
N和N'
D.
都不是
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