The expression “all of us” undergoes loss of explosion.

For systems with multiple I/O, in the state space expression, which variable describe the variation of system state？

A、X

B、Y

C、U

D、all

A、Be relevant

B、Avoid ambiguity

C、Be brief

D、Avoid obscurity of expression

A、held in common by all group members

B、held in common by most of the group members

C、a direct expression of beliefs and values

D、both positive and negative

A、be interested in

B、be crazy about

C、be fond of

D、all of the above

A．literary

B．literature

C．literal

D．literate

A、Facial expression and eye contact.

B、Politeness.

C、Punctuality.

D、All of the above.

Considering a simple portfolio investment strategy: holding N risky assets that have identical expected returns, E(r), and standard deviations, σ, and putting 1/N of your money in each. Assume that the correlation coefficients of all pairs are ρ. Denote the standard deviation of each asset and the portfolio are σ and σP, respectively. The variance of the portfolio can be expressed asWhich of the following statements is correct？

A、The first part of the expression represents the non-diversifiable risk

B、The second part of the expression represents the non-diversifiable risk

C、If ρ=1, all risk can be diversified

D、If ρ=-1, all risk can be diversified

Because language is basically culture specific, () implicature of the same expression may vary under different cultural background.

A、conventional

B、conversational

C、conventional and conversational

D、all the above