在非感染性发热中,属变态反应性疾病的是
A.血清病
B.中暑
C.大面积烧伤
D.白血病
E.急性心肌梗死
参考答案:D
The monitor theory, which is very popular among foreign language teachers in ______, was put forward by Stephen Krashen in the late 1970s.
A.America
B.Britain
C.China
D.France
流动性差铸件易产生什么缺陷?