我国饮用水标准含氟量是()
A.0.1ppm
B.0.5ppm
C.0.5~1.0ppm
D.1.0~1.5ppm
E.1.0ppm
参考答案:C
The police had _______news report written about ______ traffic accidents in the city involving _______ school children.
A.a; the ; the
B.不填;不填;the
C.a; 不填;不填
D.a ; the; 不填
利用()能比较直观地指示或表达“做功”实况,图形中的任意一点均代表行程该点驴头的负载值。
A、示功图
B、工程图
C、动液面图
D、泵况图