普通混凝土试件的标准养护条件：温度为（）℃。
A.20±1
B.20±2
C.22±1
D.22±2
参考答案：B
—Where is your father?
—He_________ Australia and he ________ Sydney for two weeks.[ ]
A. has been to; has been in
B. has gone to ; has been in
C. has been in; has been to
D. has gone to ; has been to
瓷器样胆囊是由于胆囊急性炎症所致。
