金瓷冠的基底冠厚度至少为()
A.0.1mm
B.0.2mm
C.0.3mm
D.0.5mm
E.2mm
参考答案:C
Have you noticed the problem ________ he is now in low spirits?________ come?
A.where;What
B.that;How
C.in which;For
D.what;As
均匀流动()是匀速直线运动,匀速直线运动()是均匀流动。
A.一定/不一定
B.一定/一定
C.不一定/一定
D.不一定/不一定