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【单选题】
下列说法正确的是( )。A.
截面形状为矩形并能承受载荷的直杆叫做梁。
B.
如果作用在梁上所有外力都与梁轴线垂直，则该梁产生平面弯曲。
C.
纵向对称面是梁的轴线与各横截面纵向对称轴所构成的平面。
D.
平面弯曲是指梁的横截面变形前是平面，受力变弯后仍然为平面的弯曲。
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举一反三
【单选题】What does the woman suggest at the end of the talk?
A.
People should develop a habit like David's.
B.
People need longer hours of sleep.
C.
People have different sleeping habits.
【简答题】According to the passage, what kind of habit does the father have? (1.0分)A. The habit of finding fault. B. The habit of reprimanding. C. It’s not mentioned. D. Both Aand B.
【单选题】What habit does Violet have?
A.
She starts fights.
B.
She likes to spit.
C.
She likes to chew gum.
D.
She bites her nails.
【多选题】农作物的秸杆主要由纤维素、半纤维素和木质素三大部分组成，利用生物技术可将它们转化为可再生资源，在下列所列的资源中，（）等可以由秸杆通过生物技术直接转化而来
A.
淀粉
B.
木糖
C.
苯酚
D.
乙醇
E.
葡萄糖
【单选题】What does file author suggest as the primary factor of forming a habit?
A.
Constant repetition.
B.
Easiness to act.
C.
Pleasure to perform.
D.
Human nature.
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