新建种植屋面工程的结构承载力设计，必须包括种植荷载。既有建筑屋面改造成种植屋面时，荷载必须在屋面结构承载力允许的范围内。
参考答案：对
About 170 people _____ and dozens more _____ after a flood hit an Indonesian town last week.
A．were killed; are still missing
B．have been killed; were still missing
C．are killed; are still missing
D．had been killed; were still missing
二尖瓣关闭不全可见于（）。
A.风湿性心脏病
B.感染性心内膜炎
C.先天性心脏病
D.退行性心脏病
E.以上都是
