变异性心绞痛首选（）
A.美托洛尔
B.心痛定
C.消心痛
D.硝酸甘油
E.阿替洛尔
参考答案：B
Our English teacher gives us _____. That is we should recite a short passage every day. [ ]
A. suggestion
B. advices
C. a piece of advice
绝对体积法按每立方米混凝土的绝对体积为各组成材料的绝对体积之和进行计算。( )
