下列叙述中，属于硅酸盐水泥特性的有（）
A、早期强度低
B、抗冻性好
C、耐热性好
D、水化热小
E、耐腐蚀性差
参考答案：B, E
use a clock to wake me up because at six o'clock each morning the train comesby my house. [ ]
A. couldn't
B. mustn't
C. shouldn't
D. needn't
单侧翼外肌痉挛（）
A.偏向患侧
B.偏向健侧
C.先偏向患侧后恢复正常
D.不偏
E.开口型歪曲
