就地启动时，按逆煤流开车；集控开车时，由集控室或调度室首先发出开车信号，集控开车

I’m sure your suggestion will _______ the problem .

A．contribute to solving

B．contribute to solve

C．be contributed to solve

D．be contributed to solving

接车时，列车全部进入到发线后，如未压上中岔区段时，该道岔需延时（）min才能解锁。

A.5

B.6

C.13

D.3

An investor gathered the following information about two 7 percent annual-pay, option-free bonds: Bond R has 4 years to maturity and is priced to yield 6 percent Bond S has 7 years to maturity and is priced to yield 6 percent Both bonds have a par value of $1000. Given a 50 basis point parallel upward shift in interest rates, what is the value of the two-bond portfolio（）

A. $2044.

B. $2030.

C. $2086.

中国特色社会主义理论体系包括（）。

A、毛 * * 思想

B、邓 * * 理论

C、“三个代表”重要思想

D、科学发展观

异步电动机的转子主要由（）组成。

A.转子铁心

B.转子绕组

C.转轴

D.端盖