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【单选题】
TCP 会为应用程序分配一个源端口号,TCP报文头中的源端口号占用()个字节A.
1.0
B.
2.0
C.
4.0
D.
8.0
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举一反三
【单选题】In contrast to traditional analyses of minority business, the sociological analysis contends that minority business ownership is a group-level phenomenon, in that it is largely dependent upon socialgr...
A.
They were developed exclusively by Chinese immigrants.
B.
They accounted for a significant portion of the investment capital used by Chinese immigrants in blew York in the early twentieth century.
C.
Third- generation members of an immigrant group who started businesses in the 1920's would have been unlikely to rely on them.
D.
Recent immigrants still frequently turn to rotating credit associations instead of banks for investment capital.
【简答题】所谓电平信号是指信号的“0”值和“1”值的持续时间是随意的，它以（ ）的变化作为信号的变化。而脉冲信号的 “1”值仅仅维持一个固定的短暂的时刻，它以（ ）的有、无标志信号的变化。（答案请用英文逗号隔开）
【简答题】是乳糖不耐症的原因是一部分人随着年龄增长,消化道内缺乏____而不能分解和吸收____,饮用牛乳后会出现呕吐、腹胀、腹泻等不适应症。当____活性低或缺乏时,____在肠道内不分解而直接进入大肠,使大肠渗透压增高,导致水分进入肠道管腔内,大肠中细菌繁殖,产生乳酸和CO2,至pH下降,当pH<6.5时刺激大肠,引起腹痛、腹泻。
【多选题】有关乳糖不耐症,说法正确的有
A.
出现此症状的原因是，饮用乳品者体内的乳糖酶活性不足或缺乏
B.
乳糖不耐症在我国并不常见
C.
主要症状是腹胀肠鸣和腹泻
D.
乳品中的乳糖被肠道菌群利用后所产生的的气体和其他成分造成了腹胀、腹泻
【单选题】William realized that he should have felt _______ with his job, but he didn’t
A.
contented
B.
suitable
C.
comfortable
D.
interested
【判断题】Conten t-Based Instruction better reflects learners ’ needs for learning a second language.
A.
正确
B.
错误
【单选题】He was always _______ for knowledge, and at last became an expert in the field of art.
A.
fond
B.
content
C.
brave
D.
greedy
【单选题】一些人食用了一些食物后确实产生不良反应的原因可能是：
A.
以上选项均正确
B.
乳糖不耐受与个体差异
C.
食物中毒或食物过敏
D.
过量服用维生素补充剂或肠道应激症等疾病
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