防风的功效有（）
A.透疹消疮
B.解表祛风
C.胜湿止痛
D.止痉
E.止血
参考答案：B, C, D, E
As a recent survey states, people can hardly enjoy a clear blue sky because of the high level of PM 2.5.
A．in trouble
B．on purpose
C．as usual
D．in ruins
混凝土耐久性表现在（）
A.耐蚀
B.抗渗、抗冻
C.抗碳化、碱料
D.耐热
