四台锅炉水冷壁下部均安装有水封装置,其作用是什么()?
A、解决连接问题
B、解决热态膨胀与密封问题
C、解决冷灰斗的过热问题
参考答案:B
用所给词的适当形式填空。
1.________ your sister ________(like) cold weather?
2.Jim can ________ in the river. He often ________. He likes ________ a lot. (swim)
3.Maria ________(not do) housework last Sunday.
4.It's a beautiful ________(sun) day. Let's ________(go) to the park.
5.My uncle ________ many things. He likes ________ things. Now, he ________ a new machine. (make)
6.John wants ________(ride) the machine like a bike.
7.Thank you very much for ________(teach) us so well.
8.Mr. and Mrs. Brown have two ________(child).
9.How many ________(play) are there on the playground?
10.Mr. Wu often goes ________(fish) at East Lake.
阿司匹林
A.四氮唑比色法B.铁-酚试剂比色法C.异烟肼比色法D.气相色谱法E.碘量法下列药物可采用的含量测定方法为