为了探究压强大小跟哪些因素有关,老师准备了如图所示的器材:①用钉子做腿的小桌 ②海绵 ③砝码 ④木板 ⑤盛有适量水的矿泉水瓶 ⑥装有沙的容器等供同学们选择.同学所选的四组器材中,不能达到探究目的的是( ) A . ①③⑥ B . ②⑤ C . ③④⑤ D . ②③④ 答案:C
Do not let any failures discourage you, for you can never tell ________ close you may be to victory.
[ ]
A.how
B.that
C.which
D.where