电流表要与被测电路并联。

在所有排序方法当中，关键词比较的次数与记录的初始排列次序无关的排序方法是 ______。

A．希尔排序

B．冒泡排序

C．插入排序

D．选择排序

甲有一辆宝马牌X5型号的汽车要卖掉，乙欲购买，甲对乙说：“你先开回去试用一个月，满意的话你就买下，价款40万元。”乙同意，开回汽车后未付款。在试用期间乙将汽车出租给丙，乙与丙之间汽车租赁行为的性质为（）。

A.可撤销的行为

B.无效行为

C.效力待定的行为

D.有效行为

重合闸拒动：是指（）

A.重合闸装置投入，且满足动作的相关技术条件，但断路器跳闸后重合闸未动作

B.重合闸装置投入，但不满足动作的相关技术条件，断路器跳闸后重合闸装置不动作

C.断路器跳闸后，重合闸装置动作，断路器自动合上送电后，由自动装置再次动作跳闸的过程

D.重合闸装置未投入，但满足动作的相关技术条件，断路器跳闸后重合闸未动作

During recent years we have heard much about "race": how this race does certain things and that race believes certain things and so on. Yet, the (51) phenomenon of race consists of few surface indications.

We judge race usually from the coloring of the skin: a white race, a brown race, a yellow race and a black race. But (52) you were to remove the skin you could not tell anything about the race to which the individual belonged. There is nothing in physical structure, the brain or the internal organs to (53) a difference.

There are four types of blood. All types are found in every race, and no type is distinct to any race. Human brains are the (54) . No scientists could examine a brain and tell you the race to which the individual belonged. Brains will (55) in size, but this occurs within every race. (56) does size have anything to do with intelligence. The largest brain ever examined belonged to a person of weak (57) . On the other hand, some of our most distinguished people have had (58) brains.

Mental tests which are reasonably (59) show no differences in intelligence between races. High and low test results both can be recorded by different members of any race. (60) equal educational advantages, there will be no difference in average standings, either on account of race or geographical location.

51().

A.complete 

B.full 

C.total 

D.whole

训练手段的动作过程包含动作（）、（）和（）三个阶段。