【单选题】The new CEO demanded that all inter-office communications ______ in writing rather than in person, ______ possible.
A.
have been made; whoever
B.
would be made; whichever
【单选题】The new CEO asked that all inter-office communications ______ in writing rather than in person, ______ possible.
A.
have been made; whoever
B.
would be made; whichever
【单选题】下列关于保守力做功错误的是
B.
由弹簧弹性力对物体做功特点可知,弹簧弹性力是一种保守力.
C.
由摩擦力对物体做功特点可知,摩擦力是一种保守力.
D.
由万有引力对物体做功特点可知,万有引力是保守力.
【简答题】土壤质地可分为( )、( )和( )三类。
【单选题】保守力的特点是______,保守力的功与势能的关系式为______。
【简答题】按苏联卡庆斯基的质地分级制,土壤质地可分为沙土、 和 三类