液压泵的主要性能参数有流量、容积效率、压力、功率、（）、总效率。

两条曲线y₁=x³+ax，y₂=x²+bx+c都经过点A（1，2），并且它们在点A处有公共的切线，求a，b，c的值．

阅读下面短文，按照句子结构的语法性和上下文连贯的要求，在空格处填入一个适当的词或使用括号中词语的正确形式填空，并将答案填写在答题卡标号为16～25的相应位置上。

Anna pushed herself up from the bench and walked steadily with her walking sticks toward the office．As soon as she entered the room, she saw it．_____16______ blue umbrella was there, unopened, ____17______ a floor-to-ceiling window．_____18____（see） it so near, nearly within reach, Anna forgot herself and pointed to her possession．

“That is mine,” she said．“My son brought it to me from Paris and I want it back．”

The man had risen when she entered and he ___19_______（remain） standing．He turned to look at the umbrella ____20______ she pointed．“Yes．I know the umbrella is from Paris, ” he said, showing a mix of innocence and curiosity．“Actually, it ____21______（make） in Italy, but it’s sold in Paris．It’s not the one your son gave you．I bought it myself．”

Anna stared at him．Was he claiming that it was his own umbrella? She had run all the way to this office building from the shop _____22______ her umbrella was stolen．

“My son gave _____23_____ to me,” Anna countered．“ It means everything to me, because my son is ____24______（die）．”

As soon as she said them, Anna knew she had made a mistake．She had opened herself up to a stranger．He had no business knowing the most important fact of her life, a grief she kept private．___25_____could anyone understand what her son’s death meant to her?

会计假设又称会计核算的基本前提，我国的会计基本假设有( )。

A．会计主体

B．持续经营

C．会计分期

D．货币计量

E．简化核算

债委会工作小组应根据监管部门要求，积极组织第一次债权人会议材料，主要包括（）

A.确定各行债权受偿比例

B.确定财务顾问选聘方案

C.确定近期工作方案

D.草拟《债权人协议》

为保证砂轮运行稳定安全，要求法兰盘直径不得小于砂轮直径的（）。

A、1/2-1/3

B、1/4-1/3

C、1/5-1/3

D、1/2-1/5