提取酸碱滴定法测定其含量时，不宜用强碱进行碱化的生物碱的分子结构特点为A．含有碱性氮

与其他的风险对策相比，非保险转移对策的优点主要体现在（　　）。

A．可以转移某些不可投保的潜在损失

B．双方当事人对合同条款的理解不会发生分歧

C．被转移者有能力更好地进行损失控制

D．可以中断风险源，使其不发生或不再发展

E．可以降低损失的发生概率或降低损失的严重程度

如图是“子宫内的胎儿、脐带和胎盘”示意图，请据图回答下列问题：

（1）一般来说，怀孕到第______周时，③就发育成熟了．成熟的③和______（填序号）从母体的 * * 排出，这个过程叫做______．

（2）如果孕妇喝酒、吸烟或者吃了某些药品，酒精、烟草和这些药品中的有害物质，就会通过______（填序号）到达③的体内，对③的生长发育产生不良影响．

The "Karat" marking on jewelry tells you what proportion of gold is mixed with other metals. If 14 parts of gold are mixed with 10 parts of base metal, the combination is called 14-Karat (14K) gold. The higher the Karat rating, the higher the proportion of gold in the object. The lowest Karat gold that can be marketed in the United States is 10-Karat gold. Jewelry does not have to be marked with its Karat quality, but most of it is. If there is a Karat quality mark, next to it must be the U.S. registered trademark of the person or company that will stand behind the mark, as required by the National Gold and Silver Stamping Act.

The Stamping Act is________.

A．a regulation for tax

B．rule of law

C．a law that makes such stamping mandate

D．an implement

根据小学课程与教学的特点，对小学生的学习进行评价时应该注意建立发展性评价制度，实行学生学业成绩与( )相结合的综合评价方式。

A．成长纪录袋
B．考试成绩
C．学习习惯评价
D．结果评价

阴阳不能相互维系的表现是（）

A.阳胜生热，阴胜生寒

B.阳虚生寒，阴虚生热

C.阴盛格阳，阳盛格阴

D.阴损及阳，阳损及阴

E.阴虚阳亢，阳虚阴盛