焊接接头中常见的内部缺陷有哪些？

Happy Life Swimming Club Rules
1. All swimmers must take a bath before they go into the pool (游泳池).
2. Diving (跳水) is only allowed unless you have been a member for at least 1 year.
3. Running and playing near the pool are not allowed.
4. Club members can bring guests only at weekends.
5. Children under 12 are not allowed to use the pool unless their parents are with them.
6. Members must show their membership cards before going inside.
7. Smoking is not allowed in the room for changing clothes.
8. Guests must write down their names before going inside.
9. All members must leave before 6 P.M. at workdays.
10. All members must leave before 10 P.M. at weekends.
11. Clothes must be put in the lockers (带锁柜厨).
12. Keep your key of the lockers along with you. If it is lost, you must report to the manager as soon as possible.
13. Only club members and their families are allowed to use the pool.

If you’ve lost your key of the locker, what should you do
[A] Go to find it soon.
[B] Leave the club soon.
[C] Report to the manager.

设备监理与建设监理既有联系又有区别，下列说法正确的有（）。

A.它们最主要的区别是监理的对象不同

B.时空跨度不同

C.二者的工作内容和方法是基本相同的

D.目的和工作性质都是不同的

E.如果一个建设项目中既有建设监理又有设备监理，那么它们在同一个建设项目中必须密切配合、协调一致，而且必须服从整个建设项目的管理要求

关于色彩，下面说法中正确的是（）。

A、色彩可分为有彩色和无彩色

B、有彩色可以用三组特征值表示

C、无彩色同样拥有有彩调

D、有彩色就是具备光谱上的某中或某些色相

住所地在长春的四海公司在北京设立了一家分公司。该分公司以自己的名义与北京实达公司签订了一份房屋租赁合同，租赁实达公司的楼房一层，年租金为30万元。现分公司因拖欠租金而与实达公司发生纠纷。下列判断哪一个是正确的( )。

A．房屋租赁合同有效，法律责任由合同的当事人独立承担

B．该分公司不具有民事主体资格，又无四海公司的授权，租赁合同无效

C．合同有效，依该合同产生的法律责任由四海公司承担

D．合同有效，依该合同产生的法律责任由四海公司及其分公司承担连带责任

燃料中水分含量小于（）时一般不容易被肉眼看到，而大于此含量时则出现混浊现象。

A.0.0015％（15ppm）

B.0.003％（30ppm）

C.0.002％（20ppm）

D.0.0001％（1ppm）