He was born _______ the evening ______ April 6th. [ ]
A.in; in
B.on; on
C.on; of
D.in; of
答案:C
下列哪项不是婴儿上呼吸道感染引起的并发症()
A.支气管炎
B.肺炎
C.中耳炎
D.扁桃体炎
E.咽后壁脓肿
对于水冷式空调机,冷却水温度和水量对其制冷量有何影响?