热拌沥青混合料必须在拌和厂采用拌和设备拌制,拌和设备主要有( )拌和机和( )拌和机。
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沥青混凝土路面摊铺前,摊铺机应提前预热熨平板,使其温度不低于( )℃,以免出现黏料现象。
____ do you usually go to work?
A. How
B. How much
C. How many
D. How old
I think we should discourage people____ using their private cars.
A. at
B. from
C. to
D. for