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【简答题】
为什么苯甲酸及其钠盐必须在酸性条件下才能有抑菌效果? 由于苯甲酸难溶于水,食品防腐时一般都使用苯甲酸钠,但实际上他的防腐作用仍来自苯甲酸本身,为此保
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参考答案:
举一反三
【单选题】乌头为毛茛科多年生草本,叶五角形,三全裂,又细裂,花总状花序,深蓝紫色,花期()。
A.
6-7月
B.
7-8月
C.
9-10月
D.
5-6月
【单选题】危险截面是()所在的截面
A.
最大面积
B.
最小面积
C.
最大内力
D.
最大应力
【简答题】A.Because of his age. B.Because of his major. C.Because of his family. D.Because he liked the job.
【简答题】A.Because she is an English major. B.Because all the companies need people with other skills. C.Because she speaks English well and good at computing as well. D.Because her brother recommended her.
【单选题】危险截面是 所在的截面。
A.
最小面积
B.
最大面积
C.
最大应力
D.
最大内力
【单选题】乌头总状花序,深蓝紫色,花期( )。
A.
6-7月
B.
7-8月
C.
9-10月
D.
5-6月
【单选题】Conversation Two 6. A Because he has a hard time choosing courses. B. Because he has difficulty choosing his major. C. Because he doesn't have time to declare a major D. Because he wants to extend the...
A.
A Because he has a hard time choosing courses.
B.
Because he has difficulty choosing his major.
C.
Because he doesn't have time to declare a major
D.
Because he wants to extend the deadline
【单选题】一般情况下,适合运用礼仪的交际场合主要有三种,即初次交往、因公交往和对外交往。这主要指礼仪的( )特征。
A.
规范性
B.
限定性
C.
操作性
D.
时效性
【判断题】乌头为毛茛科多年生草本,叶五角形,三全裂,又细裂,花总状花序,深蓝紫色,花期 7-8 月
A.
正确
B.
错误
【单选题】危险截面是( )所在的截面
A.
最大面积
B.
最小面积
C.
最大内力
D.
最大应力
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