【单选题】Which system(s) in the hydraulic systems of crane always hold(s) single side of load?
B.
hoisting system and luffing system
C.
hoisting system and slew and slewing system
【多选题】以下属于计算机中毒的征兆的是
A.
屏幕上出现不应有的特殊字符或图像、字符无规则变或脱落、静止、滚动、雪花、跳动、小球亮点、莫名其妙的信息提等。
C.
频繁地无故死机,随机地发生重新启动或无法正常启动、运行速度明显下降、内存空间变小、磁盘驱动器以及其他设备无缘无故地变成无效设备等现象。
D.
磁盘标号被自动改写、出现异常文件、出现固定的坏扇区、可用磁盘空间变小、文件无故变大、失踪或被改乱、可执行文件(exe)变得无法运行等。
【判断题】Paint事件的参数中可以有Graphics对象
【单选题】For a balanced three-phase △ -connected load, the average power absorbed by the load is P . Change the △ -connected load to Y-connected load, the power will :
【单选题】The slender column is under axial compressive load P, the critical load 【图片】is independent of ( ).
A.
the material of the column
B.
the length of the column
C.
the magnitude of the P
D.
the shape and dimension of the cross section of the column
【单选题】The vessel’s load line certificate is always issued by ____.
A.
The register of shipping
D.
maritime safety administration
【单选题】One should always be careful with _ (load) guns.
【单选题】The vessel’s load line certificate is always issued by ____.
A.
the register of shipping
D.
maritime safety administration
【单选题】The vessel’s Load Line Certificate is always issued by ().
A.
The Register of Shipping
D.
Maritime Safety Administration