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【单选题】
一个平面活动构件有( )3个自由度。A.
一个移动副和两个转动副
B.
两个移动副和一个转动副
C.
三个移动副
D.
三个转动副
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知识点：
皮皮学刷刷变学霸
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【简答题】大肠菌群的定义
【简答题】简述大肠菌群的定义是？
【简答题】大肠菌群的定义和卫生学意义
【单选题】The water of the Great Salt Lake is seawater.
A.
saltier than that of
B.
as salty as that of
C.
saltier than
D.
so sally as
【单选题】Great Salt Lake is fed by fresh-water streams, _________ is about four to five times as salty as the ocean.
A.
yet
B.
which
C.
there
D.
despite
【单选题】The water of the Great Salt Lake is______ seawater.
A.
saltier than that of
B.
as salty as that of
C.
saltier than
D.
so salty as