皮皮学，免费搜题
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【单选题】
可确诊早孕的一项是A.
停经
B.
恶心、呕吐
C.
乳房增大
D.
尿频
E.
B超测到妊娠囊
拍照语音搜题，微信中搜索"皮皮学"使用
参考答案：
参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【单选题】对于理想气体系统来说,在下列过程中,哪些过程系统内能增量为负值?[ ] (1) 等体降压过程. (2) 等温膨胀过程. (3) 绝热膨胀过程. (4) 等压压缩过程.
A.
只有(4)
B.
只有(1)(2)
C.
只有(1)(3)(4)
D.
只有(1)(4)
E.
(1)(2)(3)(4)
【单选题】6-2. 对于理想气体系统来说,在下列过程中,哪个过程中系统所吸收的热量、内能的增量和对外做功三者均为负值( )
A.
等容降压过程
B.
等温膨胀过程
C.
绝热膨胀过程
D.
等压压缩过程
【单选题】The reason ________ she missed school this morning was ________ she had to look after her sick grandpa. [ ]
A.
why；that
B.
because；why
C.
that；because
D.
which；that
【简答题】After she had the report (type) ______, she put it on the director's desk.
【单选题】After she found she had lost the necklace, she and her husband ________ to find it. [ ]
A.
made up their minds
B.
made their mind
C.
had made up their mind
D.
had made minds
【简答题】After she had the report (type) , she put it on the director’s desk.
【单选题】2 对于理想气体系统来说,在下列过程中,哪个过程系统所吸收的热量,内能的增量和对外做功三者均为负值( )。
A.
等容降压过程
B.
等温膨胀过程
C.
绝热膨胀过程
D.
等压压缩过程
【单选题】After the accident, she had some difficulties _______ recalling what had happened _______ her.
A.
on; to
B.
on; on
C.
in; to
D.
in; on
【单选题】如图所示,物块A的重力 ,物块B的重力 ,水平推力F作用在A上,A与竖直墙面接触,A和B匀速下滑,在推力F保持不变时,将B取走,在A的下方施加一个力 ,使物体A恰好向上做匀速直线运动,则 的大小为
A.
20N
B.
30N
C.
40N
D.
50N
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