【判断题】汽车涂装前进行除锈,可以保证金属表面后续涂层获得良好的附着力。
【单选题】— Are they cucumbers? — No, ____. [ ]
【单选题】Cut the cucumbers into pieces, _______________ the tomatoes and onions.
【单选题】Cut the cucumbers into pieces, _______________ the tomatoes and onions.
【单选题】The fifth paragraph of the passage mainly discusses
A.
the reproduction of sea cucumbers.
B.
the food sources of sea cucumbers.
C.
the eating habits of sea cucumbers.
D.
threats to sea cucumbers' existence.
【单选题】We need some _____________. [ ]
【单选题】一质量为 m0的弹簧振子,水平放置静止在平衡位置,如图所示.一质量为m的子弹以水平速度 射入振子中,并随之一起运动.如果水平面光滑,此后弹簧的最大势能为
【单选题】He could no longer contain his .