从交易价格的决定特点划分，证券交易机制可分为()

A、空串就是空白串“Empty string” is blank string.

B、空串是任意字符串的子串 Empty string is a substring of arbitrary string.

C、串只可以采用顺序存储，不可以采用链式存储 String only can be stored in sequential method and cannot be stored in linked method.

D、在C++标准中，char S[M]最多能表示长度为M的字符串 In C ++ standards, char S[M] can represent up to a string of length M.

A．20,10

B．10,3

C．20,3

D．以上都不正确

mputes a fixed,length bit string.(67)is a protocol that most USENET machines now use it to allow news articles to propagate from one machine to another over a reliable connection.(68)is an approach preferred by cable TV providers. In this solution the fiber terminates at an opt~electrical converter and the final segment is a shared coaxial cable.(69)is a device used to connect two separate network that use different communication protocol.(70)is a digital-to-digital polar encoding method in which the signal level is always either positive or negative.

A．MD

B．RSA

C．DES

D．MIB

an ______ inventor proposed an ingenious method of submerging and returning to the surface. (identify)

The best method to stop a vessel from dragging anchor in a sand bottom is to ______.

A.reduce the length of the cable

B.pay out more anchor cable

C.back the engines

D.swing the rudder several times to work the anchor into the bottom

he SqlConnection object. Your connection objects are being pooled. As the pool fills up, connection requests are queued. Some connection requests are rejected. You need to ensure that the application releases connections back to the pool as soon as possible. Also, you need to decrease the likelihood that connection requests will be rejected.Which three actions should you perform？（）

A. Ensure that the Close method is called on each connection object after it has finished executing.

B. Ensure that each connection object is left open after it has finished executing.

C. Increase the Max Pool Size value inside the connection string.

D. Increase the Min Pool Size value inside the connection string.

E. Increase the Connection Lifetime value inside the connection string.

F. Increase the value of the ConnectionTimeout property of the SqlConnection object.

cator used with the all-purpose nozzle is due to ______.

A.a difference in water pressure

B.the method of breaking up the water stream

C.the length of the applicator

D.All of the above