通过心脏右纤维三角的结构是（）
A、房室束
B、左束支
C、右束支
D、结间束
E、窦房结支
参考答案：A
(2012·浙江高考)Had they known what was coming next, they ________ second thoughts.
A．may have
B．could have
C．must have had
D．might have had
调制涂料时要注意( )。
A．取过一个空桶就可以使用
B．开桶后立即调制涂料
C．雨后立即开桶调制涂料
D．用清洁的桶调制涂料
