题目内容

A．rarelyB．openlyC．exactlyD．regularly

A. rarely
B. openly
C. exactly
D. regularly

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A. who B. which C. that D. whose

he river widens considerably as it begins to turn west．

A. extends
B. stretches
C. broadens
D. bends

A．linesB．channelsC．pathsD．currents

A. lines
B. channels
C. paths
D. currents

有悬臂梁，受力如图所示，则固定端A点的弯矩为（）kN·m。

A. 2
B. 4
C. 6
D. 8