— I as well as my family, will go to Shanghai for vacation tomorrow.    

—  __________ Do remember sending me a gift when you are back. [ ]

A. Have fun!

B. That's very nice of you.

C. It's a pleasure.

D.  D. So what?

喷射混凝土时混合料配合比中湿法水灰比宜为( )。

A．0.4～0.45

B．0.4～0.43

C．0.42～0.5

D．0.45～0.5