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【多选题】
可以套用“用量差异”和“价格差异”模式的成本项目是（ ）A.
直接材料
B.
直接人工
C.
变动制造费用
D.
固定制造费用
拍照语音搜题，微信中搜索"皮皮学"使用
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【单选题】People joke that no one in Los Angeles reads everyone watches TV, rents videos, or goes to the movies. The most popular reading material is comic books, movie magazines, and TV guides. City libraries ...
A.
city libraries have a very limited number of readers
B.
only a small proportion of the readers go to libraries by car
C.
city libraries provide fewer places for car washes
D.
city libraries have fewer parking places
【单选题】—John was heard ________ just now. What happened? —People was telling a joke.
A.
to cry
B.
cry
C.
to laugh
D.
laugh
【单选题】对于有毒药品的使用方法不正确的是
A.
实验前,应了解所用药品的毒性及防护措施
B.
实验中产生的SO2气体可直接排放到空气中
C.
操作有毒气体(如H2S、Cl2、Br2、NO2、浓HCl和HF、苯、四氯化碳、乙醚、硝基苯等)应在通风橱
D.
有些药品(如苯、有机溶剂、汞等)能透过皮肤进入人体,应避免与皮肤接触
【简答题】断口的宏观及微观形貌的哪些特征可推断为疲劳断裂?
【简答题】Some people have the age-old desire to put the joke on others.
【简答题】At the party，John made up a joke，________ people burst out laughing. A．on which B．by which C．at which D．from which
【单选题】当利用大小为n的数组(下标从1到n)顺序存储一个栈时，假定用top==n表示栈空，则每次向这个栈插入一个元素时，首先应执行（ ）语句修改top指针。
A.
top++;
B.
top--;
C.
top=0;
D.
top=n;
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