焊缝余高并（）增加整个焊接接头的强度。
参考答案：不能
对于咳嗽、痰多的支气管炎患儿，室内的湿度应保持在
A．40%
B．50%
C．60%
D．70%
E．80%
I wanted to know _________ last weekend.
A．what Mary does
B．what does Mary do
C．what Mary did
D．what did Mary do
