()的特点,要求我们必须把确保空防安全放在职业道德规范的首位.
A.行为的规范
B.职业规范
C.安检职业
D.职业道德
参考答案:C
Junk messaging has been a headache for years, __the action taken by the authori-ties has not yet produced the results expected
A.as
B.but
C.so
D.before
橡皮艇在25℃室温情况下,涂()遍胶水最好。
A.1
B.2
C.3
D.越多越好