问题
单项选择题
可燃气体报警器探头应（）进行一次校验。
A.半年
B.一年
C.两年
答案
参考答案：B
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可燃气体报警器探头应（）进行一次校验。
A.半年
B.一年
C.两年
参考答案：B
| 请从方框中选出合适的单词,完成短文.其中两项多余. | |
same class．In their class,some of the(3)_________ like playing soccer,cry much．Tommy is in the school soccer club．(4)________ of them also like playing basketball．(5)________ the girls like playing tennis(6)________ volleyball．Sally is in the school volleyball club．I(7)_______ play soccer．I only play ping-pong．And I have a small sports(8)_____．I have loping-pong(9)_____ and 9 bats．Playing(10)_______ is good for us． |