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【简答题】
在图纸上用_____画出图框。图框的格式分为______和______两种。同一种产品只能采用____格式。加长幅面的图框尺寸,按所选用的的图框尺寸确_______定。如加长幅面297X630,其图框尺寸按______选定。
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【单选题】— An Internet friend has asked me to meet him. — Oh, it's dangerous to meet him ______. [ ]
A.
lonely
B.
loud
C.
along
D.
alone
【单选题】以下关于UDP校验和特点的描述中,错误的是
A.
UDP校验和的检验范围包括伪头部、UDP报头与从应用层来的数据
B.
计算校验和时需要在UDP用户数据报之前增加12B的伪头部
C.
伪头部只在计算时起作用，既不向底层传输，也不向高层传递
D.
UDP长度指UDP数据报的长度，包括伪头部的长度
【单选题】It's dangerous to one's shoulder while driving.
A.
look over
B.
look back
C.
look around
D.
look ahead
【单选题】It's dangerous to play on the thin ice. It's not ____ to hold a person. [ ]
A.
hard enough
B.
enough hard
C.
enough cold
D.
enough thick
【单选题】It's dangerous to let the children who are _____ go swimming in the river.
A.
too young to
B.
so young
C.
not old enough to
D.
so old
【单选题】— I left my keys in the room yesterday. I had to get in _____ the window. — It's dangerous to do that. [ ]
A.
in
B.
through
C.
over
D.
to
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