护发产品的选择要根据()。
A.头发的性质
B.干性
C.油性
D.受损程度
参考答案:A, D
Being examined twice a year,whether it is a car or a bus or a truck,is the rule that every driver _______obey in this city.
A.shall
B.can
C.ought to
D.need
人工挖孔桩截面一般为圆形,也有方形桩,挖孔深度不宜超过()。
A、16m
B、20m
C、25m
D、26m