利用合同的正当手段防范风险、维护自身的正当利益，指的是施工合同的( )。A．合同管

木工平刨刀具主轴转速高，手工送料、工件质地不均匀等因素可构成安全隐患。下列关于木工平刨设计和操作的说法中，正确的有（　　）。

A．应有紧急停机装置

B．刀具主轴为方截面轴

C．刨削时压力片与刀具刨削点在同一垂直线上

D．刨床不带电金属部位应连接保护线

E．刨削深度不得超过刨床产品规定的数值

根据合同法规定，（）应当采用书面形式。

A.买卖合同

B.保管合同

C.建设工程合同

D.委托合同

关闭显示器的电源，将使正在运行的程序立即停止运行。( )

Inside the computer, the operation system (of another software module called a data communication (71) )must decide which program will get control next. Each program remember, is associated (72) . a particular front -end port. If a program’s data have not yet reached its front - end buffer, there is no point giving that program control. Thus the data communication monitor sends its own (73) signal to the front -end devices next port is polled. Note that the (74) computer speed. The computer never has to wait for a terminal or a communication line. Instead, it is the expressive front - end processor that waits for the slower system (75) to respond.

（74）处填（）。

A.great

B.huge

C.mainframe

D.large