氨硝酸银使用于抗牙本质过敏时,在牙面涂()
A.30秒
B.1分钟
C.15分钟
D.2分钟
E.10秒
参考答案:B
All of us found ________ hard to get along with him, he was too strict with others but not with himself.
A.this
B.that
C.it
D.it’s
“货物总值”:5600美元。