丹参、茯苓都具有的功效是()
A.凉血止血
B.消肿生肌
C.安神宁心
D.利尿消肿
E.化瘀止血
参考答案:C
What _______he do on his last school trip?[ ]
A. does
B. did
C. is
D. was
混凝土抗冻等级F15中的15是指()。
A.最大冻融次数为15
B.-15摄氏度的冻融温度
C.混凝土强度损失不超过15%
D.混凝土质量损失不超过15