下列哪项试验不是细菌的生化反应()。
A.靛基质试验
B.动力试验
C.甲基红试验
D.糖发酵试验
E.枸橼酸盐利用试验
参考答案:B
根据句意及首字母提示完成单词
1. I have a ping-pong b______.Let's play pingpong.
2. Let's go to an English c ____.
3. My father likes playing s ____.
4. I want to play tennis, but I don't have a tennis r ____
5. —Let's play volleyball.
—That s ____ good.
冲孔件上孔与边缘之间的距离不能过小,以避免工件变形、模壁过薄或因材料易被拉入凹模而影响模具寿命。一般而言,孔边距取:圆孔()t,矩形孔()t。
A、(1-1.5),(2-2.5)
B、(0.5-1),(1-1.5)
C、(1-1.5),(1.5-2)