吸毒所致的最突出的精神障碍是什么?
参考答案:
幻觉和思维障碍
(2013·新课标Ⅱ,11)A serious study of physics is impossible________some knowledge of mathematics.
A.against
B.before
C.beyond
D.without
硝酸铵炸药的储存期为( )个月。
A.1~2
B.2~4
C.4~6
D.6~8