“四群四带”城市化战略格局的“四带”是指右江河谷走廊、黔桂走廊、（）和桂东北城镇带。

根据句意，用所给单词的适当形式填空。

1. Look, there is a bird _____ (sing) in the tree.

2. The bad air makes my chest hurt and it's difficult for me _____ (breath).

3. They are doing their homework carefully. You'd better not _____ (disturb) them.

4. Litter _____ (influence) the look of our city.

5. It is known that smoking does great _____ (harm) to us.

找平层的质量好坏不影响到防水层的质量。

外表面淡灰棕色，有的可见斜方形皮孔，内表面紫褐色，折断时可见细密银白色富弹性胶丝的药材是（）

A.地骨皮

B.秦皮

C.杜仲

D.五加皮

E.苦楝皮

异步电动机串级调速时所能产生的最大转矩比正常接线时减少了（）。

贯通伤