Frames to which the tank top and bottom shell are fastened are called（）.

[单选题]At the top of the A-frames there is a strong cast iron frame called （）.A . cylinder linerB . cylinder coverC . the gear boxD . the scavenging box

[单选题]定位第一条记录上的命令是______。A．GO TOP B、GO BOTTOM C、GO 6 D、SKIP

[单选题]关于Top-down与Bottom-up策略，下列说法不正确的是（）A . Top-down策略是对完整蛋白质直接进行分析鉴定的自上而下的策略B . Bottom-up策略以蛋白质酶解后的太大为分析对象的自下而上的研究策略C . Top-down策略不适宜用于对蛋白质翻译后修饰的表征D . Bottom-up策略不适宜用于对蛋白质翻译后修饰的表征

[单选题]设栈的顺序存储空间为S(0:49)，栈底指针bottom=49，栈顶指针top=30(指向栈顶元素)。则栈中的元素个数为()。A．30B．29C．20D．19

[问答题]设栈的存储空间为S（1：40），初始状态为bottom=0，top=0。现经过一系列入栈与出栈运算后，top=20，则当前栈中有__________个

[问答题]设栈的存储空间为S(1:40)，初始状态为bottom=0，top=0，现经过一系列入栈与出栈运算后，top=20，则当前栈中有___________

[单选题]（） of the A-frames there is a strong cast iron frame called the scavenging air box.A . At the topB . At the bottomC . In the topD . In the bottom

[单选题]_________ is a little oil in the tankA．ThereB．ThisC．ThoseD．These

[单选题]A level gauge for a tank is to （）.A . give the pressureB . give the contentsC . give the shape of the tankD . give the accuracy level

[单选题]A-frames are mounted on the bed plate and support （） and cylinder block.A . the main bearingB . the cylinder coverC . the entablatureD . the sum