额外心音大多出现在
A.S1之前、S2之后
B.S2之前、S1之后
C.S3之前、S2之后
D.S4之前、S3之后
E.S1之前、S4之后
参考答案:A
首字母填空。
Tea is a kind of drink. P 1 often talk about it. There are d 2 kinds of tea. It usually g 3__on
the hills. Tea is popular in China. It is a 4 popular in many other c 5 . In South China, people like
r 6 tea. But in North and East China, people like green tea with n 7 in it. The English people like
tea with milk and s 8 . People drink tea b 9 it’s very good for h 10 .
物流系统提高运行效率的“瓶颈”环节是( )。
A.运输
B.装卸搬运
C.流通加工
D.配送