煤气管道着火时管径小于()毫米可直接关闭阀门。
A.120
B.100
C.50
参考答案:B
President-elect Barack Obama has asked his economic team for ______ recovery plan that creates 2.2 million jobs, for ______ US economy is losing jobs at an alarming rate.
A. a; the B the; the C. /; the D. a; /
脑性瘫痪的定义,正确的叙述()
A.主要表现为中枢性运动障碍及姿势异常
B.一种独立的疾病
C.通常不伴有癫痫、行为异常等并发损害
D.三要素为发育性、成熟性、永久性
E.主要表现为智力障碍