程序包()在STD_LOGIC_1164程序包的基础上扩展了三个数据类型:UNSIGNED、SIGNED和SMALL_INT,并为其定义了相关的算术运算符和转换函数。 A: STD_LOGIC_SIGNED B: STD_LOGIC_ARITH C: STD_LOGIC_UNSIGNED D: STD_LOGIC_1164

Based on the attributes of logic, logic can be divided into five types， and which of the following is not the right type?（ ） A: Aristotelian logic B: modern inductive logic C: traditional logic, D: mathematical logic

It was suggested that the agreement _____ before the end of the year. A: be signed B: was signed C: would be signed D: had be signed

PLC英文名称？ A: Programmable Logic Controller B: Personal Logic Controller C: Programmable Logic Computer D: Personal Logic Computer

It is essential that the contract __________ before other companies negotiate with them. A: must be signed B: is signed C: be signed D: to be signed

用"useradd std"命令添加一个用户，这个用户的主目录是什么?( )。 A: etc/std B: var/std C: home/std D: in/std

It is desirable that the agreement ______ before the New Year's Day. A: was signed B: is signed C: be signed D: D. has been signed

‌用"useradd std"命令添加一个用户，这个用户的主目录是什么?‍ A: /etc/std B: /var/std C: /bin/std D: /home/std

以下代码写法哪个不符合工程规范？ A: using namespace std; B: using std::endl; C: std::cout << "Hello"; D: using std::endl;,std::cout << endl;

We regret to tell you that the contract ________ by our two companies has to be revised. （ ） A: being signed B: to be signed C: having signed D: signed