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【简答题】
某地方有座弧形的拱桥，如图，桥下的水面宽为7.2米，拱顶水面2.4米，现有一艘宽3米，船舱顶部为长方形并水面2米的货船要经过这里，此货船能顺利通过这座拱形桥吗？
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皮皮学刷刷变学霸
举一反三
【单选题】先随机选择一些被访者并对其实施访问,再请他们提供另外一些属于所研究目标总体的调查对象,根据所形成的线索选择此后的调查对象,这是一种( )。
A.
PPS 抽样
B.
方便抽样
C.
滚雪球抽样
D.
随意抽样
【单选题】Although _____ Manga (日本漫画）can be very interesting, we need to remember that _____ other kinds of things is necessary.
A.
read; read
B.
reading; read
C.
reading; reading
D.
to read; to read
【单选题】If we were to allow that much current to go through the ignition switch, we would____ need a very large switch, but all the wireswould have to be the size of battery cables.
A.
so
B.
only
C.
not only
D.
more
【单选题】—Is the H1N1 flu (流感) very serious now? —No, I don't think so. However, we _______ need to be careful with it. [ ]
A.
Also
B.
neither
C.
still
D.
don't
【单选题】当航空器要求空中放油时,航空器驾驶员应当通知管制单位。需要管制单位与航空器驾驶员进行协调,以下不正确的是
A.
航路应尽可能避开城市和城镇
B.
最好在水面上飞行
C.
远离雷雨地区
D.
高度层低于1800m
【单选题】At a time of this economic crisis, our _____ should be very clear about what we need to do.
A.
principle
B.
priority
C.
premium
【单选题】Although _______ manga (日本漫画) can be very interesting, we need to remember that _____ other kinds of things is necessary.
A.
read; read
B.
reading; read
C.
reading; reading
D.
to read; to read
【简答题】柱塞式液压缸是( )式液压缸,液压油进入油缸时,推动柱塞带东运动部件移动,但( )退回时必须靠其他外力或自重来驱动。
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