起重机的钢绳将500牛顿的物体匀速提高6米后,又水平匀速移动4米,钢绳的拉力对物体所做的功为_________焦耳,重力做的功为__________焦耳。
3000;3000
. John's success has nothing to do with good luck. It is years of hard work __________has made him what he is today.
A.why
B.when
C.which
D.that
门脉高压症和肝功能减退是肝硬化主要的临床表现。