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【单选题】
“ 三心定理 ” 是:A.
3 个构件具有 3 个瞬心
B.
平面机构中的 3 个构件具有 3 个瞬心，且位于一条直线上
C.
平面机构中的 3 个构件具有 3 个瞬心，它们构成一个三角形
D.
平面机构都具有 3 个瞬心，它们构成一个三角形
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举一反三
【单选题】What happened to the man?
A.
His car broke down.
B.
He broke his phone.
C.
He lost his way.
【简答题】简述各年龄小儿贫血的血红蛋白数值。
【单选题】The car______halfway for no reason.
A.
broke off
B.
broke out
C.
broke up
D.
broke down
【单选题】His car ___ on his way home yesterday. A. broke B. was broke C. was down D. breaking
A.
broke
B.
was broke
C.
was down
D.
breaking
【单选题】His race-car _____ halfway. He had to give up the race. [ ]
A.
broke down
B.
broke in
C.
broke up
【简答题】文件B如果想使用头文件A中声明的函数，则需要在B文件中适当位置添加_________
【单选题】A stranger ___ his room without his permission.
A.
broke up
B.
broke out
C.
broke into
D.
broke down
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