My mother often ____________ a nice cake for my birthday.[ ]
A. make
B. makes
C. making
答案:B
滚珠丝杠传动不具有()性能。
A.间隙可调
B.可拆
C.可预紧
D.自锁
模板立柱采用方木的话,其尺寸一般为()。
A.5cm×8cm
B.8cm×10cm
C.10cm×10cm
D.10mm×12cm