已知NaOH溶液的∞=2%.,p=1.021g/mL,则其质量浓度是()g/L。
A.10.2
B.20.4
C.40.8
D.61.2
参考答案:B
首字母填空:根据短文内容,填出所缺单词。
Hi, I am Liu Qiang. Do you k__1__me? Today I'm w__2__a green shirt and brown t__3__. This is
my dog. I call it Candy. It's a little dog. It h__4__two black eyes. I like it very m__5__. We often p_6__
together. That is my grandfather. He is very o__7__. He l__8__after his bird every day. His bird is very
b__9__. I__10__colour is black. I like my white dog and my grandfather likes his black bird.
1. k_______ 2. w_______ 3. t_______ 4. h_______ 5. m_______
6. p_______ 7. o_______ 8. l_______ 9. b_______ 10. I________
V形块常用于内圆柱表面的定位。( )