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【判断题】
只要闭合导体回路的一部分在磁场中做切割磁感线的运动时,回路中就会产生感应电流。A.
正确
B.
错误
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【简答题】下面循环语句,能够实现100次循环的有A. unsigned char i; for(i=0;i<100;i++) { //执行的语句 } B. for(i=0;i<=100;i++) { //执行的语句 } C. unsigned char i=0; do { //执行的语句 i++; } while（i<100）; D. unsigned char i=0; do { //执行的语句 i++;...
【简答题】从订单表中删除客户号为'1001”的订单记录，正确的SQL语句是A）DROP FROM订单WHERE客户号='1001'B）DROP FROM订单FOR客户号='1001'C）DELETE FROM订单WHERE客户号='1001'D）DELETE FROM订单FOR客户号='1001'
【单选题】下列有关荧光光谱的描述,错误的是
A.
荧光光谱是通过测量荧光体的强度随发射波长变化而得的光谱
B.
荧光光谱和激发光谱呈对称镜像关系
C.
银行光谱的形状与激发波长有关
D.
荧光光谱位于激发光谱的右侧
E.
荧光光谱强度与激发光谱相似,但不能完全重叠
【简答题】1903年美国心理学家桑代克出版了___________，这为西方该学科体系的确立奠定了基础。
【单选题】Choose the summary that best expresses the main idea of Paragraph 3.
A.
The risk factor in a portfolio can be reduced by including assets whose risks are complementary, i. e. , if one loses value because of particular circumstances the other gains because of those circumstances.
B.
One should try to eliminate all risks from one's portfolio by only buying very safe shares.
C.
Under no circumstances should a careful investor add high risk assets to his/her portfolio even though the income or capital gain that may be received from that high risk asset could be very large.
【单选题】从订单表中删除客户号为1001的订单记录,正确的是
A.
DROP FROM 订单 WHERE 客户号='1001'
B.
DROP FROM 订单 FOR 客户号='1001'
C.
DELETE FROM 订单 WHERE 客户号='1001'
D.
DELETE FROM 订单 FOR 客户号='1001'
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