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【单选题】
不可压缩性流在管道内稳定流动的连续性方程式为()A.
u1Ａ1=u2Ａ2
B.
u1Ａ2=u2Ａ1
C.
u1Ａ1/ρ1=u2Ａ2/ρ2
D.
u1Ａ1/ρ2=u2Ａ2/ρ1
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【简答题】Are you happy to be a housewife? _______.
【单选题】Which subject is taken as a general background course? 查看材料
A.
English sociology．
B.
Journalism．
C.
Freshman French．
D.
Writing．
【单选题】You can check your e-mail by yourself，but owning an e-phone
A.
you can know the arrival of an e-mail immediately．
B.
you can check your e-mails more quickly．
C.
you can depend on the e-phone to check per day．
D.
can help you delete unnecessary e-mails．
【多选题】承诺的有效条件包括（ ）。
A.
承诺必须由受要约人向要约人作出
B.
承诺必须以书面形式作出
C.
承诺的内容应当与要约的内容完全一致
D.
承诺必须在要约的有效期限内作出
E.
承诺不能对要约的内容做任何非实质性的改变
【简答题】Carlos offers a general piece of advice for public speaking, which is ______.
【单选题】—What do you think of that housewife? —She is _____ of a good housekeeper, for the children’s room is always a terrible mess.
A.
nobody
B.
somebody
C.
nothing
D.
something
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