磷酸盐结石（）A．酸性尿液  B．碱性尿液  C．乳糜尿  D．高比重尿  E．低比

An instruction is made up of (41) that specify the function to be performed and operands that represent the data to be operated on. For example, if an instruction is to perform the operation of (42) two numbers, it must know (43) the two numbers are. The processor’s job is to (44) instructions and operands from memory and to perform each operation. Having done that, it signals (45) to send it next instruction.

A．get

B．push

C．make

D．put

下列等式中，从左到右的变形为分解因式的是（　　）

A．12a²b=3a²•4b

B．（x+1）（x-1）=x²-1

C．x²-2x-1=x（x-2）-1

D．bR+br=b（R+r）

第二度Ⅰ型房室传导阻滞（）

A．P波呈双峰

B．P-R间期逐渐延长

C．P波消失，代之以f波

D．P波与QRS波群完全无关

E．P波为逆行型，与QRS波群关系恒定

有“六十年间万首诗”之称的著名爱国诗人是（）。