目前认为每次输入的血液中含有的白细胞数少于多少不发生同种致敏()
A.5×1010
B.5×109
C.5×108
D.5×107
E.5×106
参考答案:E
Rod loves_____ clocks. However, he is never able to put them together again.
A.taking apart
B.removing away
C.telling apart
D.putting away
击实试验叙述正确的是()
A.需准备3个含水率的试样
B.需要准备5个含水率的试样
C.土样加水拌匀浸泡
D.轻型击实每层25击
E.以上全错