下列属于纯黏液腺的小涎腺为( )
A.唇腺
B.颊腺
C.舌前腺
D.磨牙后腺
E.舌后腺
参考答案:E
解析: 舌腭腺、腭腺和舌后腺均属纯黏液腺。
—You have found your lost umbrella, haven't you?
—Yes. I ______ it behind the door this afternoon. [ ]
A. have found
B. will find
C. found
混凝过程中的运行控制条件包括pH、水温、混凝剂的选择和投加量以及()
A.有毒物质
B.废水水质
C.水力条件
D.废水水量