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【单选题】
双筋矩形截面梁，正截面承载力计算公式的第二个适用条件x≥2a'的物理意义是()A.
防止出现超筋破坏
B.
防止出现少筋破坏
C.
保证受压钢筋达到规定的抗压设计强度
D.
保证受拉钢筋达到规定的抗拉设计强度
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举一反三
【单选题】In recent days, 33 persons have been infected with the H7N9 virus, _____9 deaths.
A.
causing
B.
caused
C.
to cause
D.
cause
【单选题】He , along with three other students, __ some funny pictures in recent days.
A.
have downloaded
B.
download
C.
has downloaded
D.
downloaded
【单选题】In recent days ,with the help of our teacher , I have made ___ great progress in _____mathematics.
A.
a; the
B.
/ ;/
C.
/ ; the
D.
a ; /
【简答题】South Korea raised its (10) ______ to the highest "red" level on Sunday as the number of COVID-19 infection cases (11) ______ in recent days with the (12) ______ rising to 7.
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