建筑石油沥青主要特点是塑性好、粘度低,而道路石油沥青的特点是粘度大、耐热性好、弹性大。
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当环境温度升高时,钢材的强度()。
A. 下降
B. 不变
C. 上升
D. 可能下降,可能上升
钢筋和砼之间的粘结力主要由()构成。
A. 摩阻力
B. 胶着力
C. 咬合力
D. 粘结力
Property is defined _______ the rights a person has to the use and disposition of an object.
A. regarding as
B. concerning
C. relating
D. looking
The old man was seriously ill and he was in _____ need of treatment.
A. main
B. popular
C. urgent
D. upset