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【单选题】
在恒定电场中,分界面两边电场强度的法向方向是A.
不连续的
B.
连续的
C.
不确定的
D.
等于零
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皮皮学刷刷变学霸
举一反三
【单选题】You ______ him the news it just made him sad.
A.
don't need to tell
B.
didn't need to tell
C.
needn't tell
D.
needn't have told
【单选题】The man _____ was a friend of mine. [ ]
A.
you just talked to
B.
whom you just talked to him
C.
who you just talked to him
D.
which you just talked to
【单选题】Do not talk to him about his boss. It just makes him()
A.
hot under the collar
B.
over the moon
C.
on cloud nine
D.
feel blue
【单选题】如图所示,一重物重为G,置于粗糙斜面上,物块上作用一力F,且F=G。已知斜面与物块间的摩擦角为 25o 。物块能平衡的情况是( )。
A.
都能平衡
B.
（ａ）、（ｃ）可以平衡
C.
（ｂ）可以平衡
D.
都不能平衡
【简答题】影响舒张压的主要因素是
【单选题】I forgot ______ a letter to him, so I wrote to him just now.
A.
writing
B.
having wrote
C.
to have written
D.
to write
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