停药综合征的主要表现是（）
A.二重感染
B.共济失调
C.戒断症状
D.症状反跳
E.过敏反应
参考答案：D
The terrible disease, ______ already kills about one million people each year, has grown resistant ______ standard medicine..
A．which, to
B．that, to
C．that, against
D．which, against
砂和砂石地基垫层应分层铺设，分层夯实或压实。在基坑内，应设置5m×5m的网格标桩，控制每层垫层的虚铺厚度。当采用插振法、平振法、夯实法或水撼法时，每层虚铺厚度不得超过( )。
A．150mm
B．250mm
C．350mm
D．450mm
