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【简答题】
如图是一几何体的三视图，正视图是一等腰直角三角形，且斜边 长为2；侧视图一直角三角形；俯视图为一直角梯形，且 , 则异面直线 与 所的正切值是（ ）。
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反馈参考答案：
举一反三
【单选题】I think this is the very work that we must finish ____ her.
A.
to help
B.
help
C.
helping
D.
helped
【单选题】With his mother_______ him, he is getting on well with his work.
A.
helping
B.
to help
C.
help
D.
helped
【单选题】I will ___ you to dinner because you helped me with my work.
A.
treat
B.
thank
C.
make
【单选题】Having no one else _____ him with the work, he had to put it off till later.
A.
help
B.
Helped
C.
helping
D.
to help
【单选题】要为文本或图像添加 E-mail 链接,需要在“链接”框中邮箱地址前添加()。 To add an E-mail link to a text or image, what code () needs to be added before the E-mail address in the link box?
A.
news:
B.
fip://
C.
http://
D.
mailto:
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