当普通浸锡炉内焊料充分熔化后应（）。
A、关闭电源
B、转向保温档
C、降低温度
D、再提高温度
参考答案：B
— How is everything going on with you abroad?
— Quite well. Not so smoothly as I expected, _____.[ ]
A. instead
B. as well
C. either
D. though
流感监测网络实验室收到标本后（）小时内，立即对呼吸道标本开展甲、乙型流感病毒通用引物H5、H7亚型的检测。
A.2
B.6
C.12
D.24
