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【单选题】
在进行单元测试时,常用的方法是A.
只适用白盒测试
B.
采用黑盒测试，辅之以白盒测试
C.
采用白盒测试，辅之以黑盒测试
D.
只适用黑盒测试
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知识点：
皮皮学刷刷变学霸
举一反三
【简答题】The ( ) balance of an account is either a debit or credit depending on whether increases in the account are recorded as debits or credits.
【单选题】An increase in the nominal interest rate increases the quantity of credit card services because
A.
bank profits go up.
B.
of intertemporal substitution.
C.
the opportunity cost of making transactions with money has risen.
D.
the substitution effect is greater than the income effect.
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