— What are these?
— _____________ kittens. [ ]
A. It's
B. They're
C. The're
答案:B
呼吸性酸中毒时()
A.PaCO↑
B.PaCO↓
C.肺过度换气
D.肾脏排出氢离子减少
E.肾脏重吸收HCO减少
装置引燃料时要检查管线上所有放空点有关阀门是否打开排液。