在整定PID调节器参数时，PB太小，Ti太短，Td太长都会使动态过程产生振荡，其振荡

糖尿病的基本病理生理改变是（）。

A.胰岛素绝对或相对不足

B.胰高血糖素分泌过多

C.糖皮质激素分泌过多

D.葡萄糖耐量减低

E.生长激素分泌过多

岗位评价要素的特征不包括（）。

A.共通性

B.显著性

C.可观察性

D.可衡量性

颗粒最大的脂蛋白是（）

A.CM

B.VLDL

C.IDL

D.LDL

E.HDL

关于二尖瓣关闭不全杂音的传导，正确的是（）

A.向颈部传导局限

B.不传导

C.向左腋下、左肩胛下区传导

D.向胸骨上窝传导

E.向心尖部传导

Which of the following statements is closest in meaning to the passage you have just heard().

A. There is plenty of grain in the world and people need not to worry about it.

B. The world’s population is estimated to explode from over 6 billion now to 19 billion by 2050.

C. The population increase is mainly in undeveloped countries.

D. World demand for foods is predicted to rise 50% by 2030.