何为硬化剂?选择原砂的原则?
参考答案:
硬化剂为含有—CH2—基团或析出甲醛的物质。选择原砂的原则:纯净,粒形园整和表面无杂质。
Nick is looking for another job because he feels that nothing he does____ his boss.
A.serves
B.. satisfies
C.promises
D.supports
公开辱骂监狱民警,根据情节轻重,给予()。
A、严管集训、警告或记过
B、批评教育或严管集训
C、警告或禁闭