材料的冲压成形性能包括()和()两部分内容。
参考答案:形状冻结性;贴模性
康明斯发电车中并车电路中采用()同步指示灯。
A.1盏
B.2盏
C.3盏
D.4盏
Jim often does ________ at school. [ ]
A. homework
B. homeworks
C. housework