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【单选题】
若－3减去一个有理数的差是－6，则－3乘以这个有理数的积是（ ）A.
9
B.
－9
C.
6
D.
－6
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举一反三
【简答题】A．essential B．elementary C．necessary D．principal
【单选题】How is the principal amount of an interest-only loan repaid?
A.
The principal is forgiven over the loan period so does not have to be repaid.
B.
The principal is repaid in equal increments and included in each loan payment.
C.
The principal is repaid in a lump sum at the end of the loan period.
D.
The principal is repaid in equal annual payments.
【简答题】委托人(principal)
【单选题】The coefficient vector of the principal component expression is the eigenvector of _______________.
A.
the covariance matrix of original variables
B.
the covariance matrix of principal components
【单选题】The principal-Agent problem is mainly because
A.
it is costly and hard for the principal to monitor the agent.
B.
the principal and agent have different incentives
C.
some of the principals have the incentive to take a free-ride of other principals' monitoring
D.
all of the above
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