不符合支原体肺炎的临床症状是（）
A.年长儿多见
B.全身中毒症状不重
C.肺部体征不明显
D.高热
E.呼吸困难明显
参考答案：E
A cabinet or space containing the controls or valves for the fixed firefighting system must be（）.
A.posted with instructions on the operation of the system
B.ventilated and equipped with explosion-proof switches
C.painted with red and black diagonal stripes
D.equipped with a battery powered source of emergency lighting
机车用砂的湿度、杂质规定为：（）
A、其水分按重量计不大于：0.5%
B、金属杂质不超过2%
C、粘土不超过3%
D、尘土不超过10%
