【多选题】以下对内分泌系统描述错误的是
A.
内分泌腺如甲状腺,胰岛,肾上腺属于内分泌系统
C.
许多非内分泌组织中有内分泌细胞,可合成和分泌激素,但它们不属于内分泌系统
【简答题】An efficient reader always changes his rate according to his ______ and the difficulty of the reading material.
【单选题】随机原则是指每个研究对象无论是被抽取或分组等,机会都是____的。
【单选题】abridge [E5bridV]
A.
n. 摘要, 大纲 adj. 简短的, 短暂的 vt. 摘要, (军事)下达简令
【简答题】供应链网络规划优化数学模型由决策变量、目标函数和_________构成。
【单选题】In order to be more productive and efficient, the board decided to ______ a sound system of operation.
【单选题】The efficient rate of emissions occurs when:
A.
there is absolutely no damage done to a pristine environment.
B.
government forbids all pollution no matter what the cost.
C.
the marginal social benefits of pollution exceed the marginal social costs of pollution.
D.
the change in social benefits and the change in social costs due to an additional unit of emissions are equal.
【简答题】琴师是如何弹奏三种音色的呢? (描绘演奏技手法)