【单选题】When Amy worked she was badly paid because______.
B.
she didn't put her mind into her work
C.
she dreamed of being a pilot
D.
she failed to type well
【单选题】She studied hard at school when she was young; _____ contributes to her success in her career.
【单选题】在斜二等轴测图中,取轴间角XOY和YOZ均为135°时,XOZ轴间角为
【判断题】理想变压器具有阻抗变换的作用,在正弦稳态下,如果次级接入电感L时,折算到初级将为nL。
【判断题】作业前,必须将作业的受限空间与其他空间、管道等进行可靠隔离,并视空间情况进行清理、清洗、置换、通风等,可能存在有机物的受限空间必须检测硫化氢、甲烷、一氧化碳、二氧化碳等气体浓度。
【单选题】根据板块构造学说,世界上大多数火山、地震发生在
【判断题】理想变压器具有阻抗变换的作用,在正弦稳态下,如果次级接入电容C时,折算到初级将为【图片】。