大中城市交通特点有哪些?
参考答案:
人多车杂,子巷密布,交通拥挤。交通管理组织与设施比较严密、完善,行人有遵守交通规则的常识和良好的习惯。
―Which would you like, a hamburger or a sandwich?
― _____ of them is OK. I think _______ of them are delicious.
A.Either, All
B.Neither, both
C.All, either
D.Either, Both
攻一M10mm X l.2mm的螺纹,求钻孔的钻头直径为多少mm。