皮皮学，免费搜题
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搜题
【单选题】
某力在直角坐标系的投影为FX=3KN,FY=4KN,此力的大小为( )KNA.
7
B.
1
C.
12
D.
5
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参考答案：
参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【单选题】He often sat in a small bar drinking considerably more than __.
A.
he was in good health
B.
his good health was
C.
was good for his health
D.
his health was good
【单选题】He often sat in a small bar drinking considerably more than _________.
A.
he was in good health
B.
his health was good
C.
his good health was
D.
was good for his health
【判断题】剪板机的基本结构:普通剪板机一般由机身、传动系统、刀架、压料机、前/后档料架、托料装置、刀片间隙调整装置、灯光对线装置、润滑装置、电气控制装置等部件组成。
A.
正确
B.
错误
【多选题】如图所示,为铸铁拉伸或压缩时的应力应变曲线,由图可知( )。
A.
铸铁的抗压强度比抗拉强度小；
B.
铸铁的抗压强度比抗拉强度大得多；
C.
压缩破坏时的变形较小，但比拉伸破坏时的变形要大得多；
D.
铸铁这类脆性材料宜于作受压构件；
【单选题】He often sat in small bar drinking considerable more than ________.
A.
he was in good health
B.
his health was good
C.
his good health was
D.
was good for his health
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