水泥粉煤灰碎石桩是在碎石桩的基础上掺人(),加水拌和后制成的具有一定强度的桩体。
A.大量水泥
B.少量水泥
C.粉煤灰
D.适量石屑
E.适量石灰
参考答案:B, C, D
已知2sin2α-sinαcosα+5cos2α=3,则tanα的值是( )
A.1
B.-2
C.1或-2
D.-1或2
No driving after drinking is a rule that every driver _____ obey in our country. [ ]
A. will
B. shall
C. may
D. can