To safeguard the operator and other personnel working on or near a hoisting operation, which of the following precautions should be observed?

A．Keep a load on the hoist until all personnel are finished working

B．Set the load on a movable dolly when transportation may be needed

C．Have one man keep a hand on the load to steady it

D．Insure that the lifting gear capacity is not exceeded

[主观题]Operator overloading operator+= which appends another String instance into current Stringinstance.

[主观题]A．ssignment operator.

[单选题]如果算符函数调用格式的表达式：x.operator-(operator++(y，0)中的“—”是作为成员函数重载的，“++”是作为友元函数重载的，那么该表达式还可以表示为：()A．x-y++B．x-(++y)C． (x++)-yD．++x-y

[单选题]如果算符函数调用格式的表达式：x.operator-(operator++(y，0)中的“-”是作为成员函数重载的，“++”是作为友元函数重载的，那么该表达式还可以表示为：( )A．x-y++B．x-(++y)C．(x++)-yD．++x-y

[主观题]A． conversion operator which converts the current String instance into raw C-style. string oftype const char*.

[名词解释] 操纵基因（operator）

[单选题]The container operator looks forward to（）the goods before the end of this month.A . aeliveryB . delivery ofC . our deliveryD . deliver

[单选题][A] inspective [B] irrespective [C] perspective [D] prospective

[单选题]A．ccording to Paragraph 2, why may a person suddenly forget who has called?A． He may leave his prefrontal cortex temporarily damaged.B． He is probably interrupted by another task.C． He is probably not very familiar with the person he has called.D． He

[单选题]In the author’ s eyes，one who views personal growth as a process wouldA．succeed in climbing up the social ladderB．judge his ability to grow from his own achievementsC．face difficulties and take up challengesD．aim high and reach his goal each time