Are your parents strict _____ you? [ ]
A. at
B. in
C. with
D. to
答案:C
一般铰刀切削部分前角为()。
A.0°~3°
B.6°~8°
C.6°~10°
D.10°~16°
混凝土强度等级是在标准条件下(温度20±3℃,相对温度,90%以上)养护()
A.27d
B.30d
C.31d
D.28d