【简答题】求下列集合的并集: (1) A ={ 3,4,6,7 }, B ={ 2,3,5,7 }; (2) A ={ x | x 3 3}, B ={ x |0< x <5}; (3) A={班内全体男生}, B={班内全体女生}.
【简答题】求下列集合的基数. (1)A={0,2,4,6,…,50);(2)B={x|x∈R并且x 2 +1=0}; (3)S={0,3,6,9,…};(4)T={10,11,12,13,…}.
【单选题】某样本中含有蔗糖,若直接通过液相色谱法测定,不适合的检测器是:
【多选题】《商品名称及编码协调制度》中的税(品)目所列货品,除完整品或制成品外,还应包括( )。
B.
具有完整品或制成品基本特征的不完整品或未制成品在进出口时的未组装件或拆散件
【单选题】The conversion of two syllable nouns into verbs usually involves a change of _____.
【简答题】注册会计师监盘存货前应当确定存货盘点的范围,以下有关存货盘点的范围的确定正确的有( )。
【判断题】The conversion between nouns and verbs may involve a change of stress.
【单选题】The conversion of two syllable nouns into verbs involves a change of _______.
【简答题】已知集合M是由满足下列性质的函数f(x)的全体所组成的集合:在定义域内存在x 0 ,使得f(x 0 +1)=f(x 0 )+f(1)成立. (1)指出函数f(x)= 1 x 是否属于M,并说明理由; (2)设函数f(x)=lg a x 2 +1 属于M,求实数a的取值范围.
【单选题】The conversion of two-syllable nouns into verbs usually involves a change in _____.