It is ________ very popular gift.A. a ki

平衡线法借助平衡线规定各生产环节的任务，并通过计算______与 ______的对比分析，及早发现影响作业计划完成的原因，尽量避免物流中断。

Jiangsu Province ____ a series of activities to protect water resources over the past few months. Early this year, several cities ___ citizens to use new types of toilet equipment.

A．organised; called for

B．has organised; called for

C．organised; has called for

D．has organised; has called for

复合构词法

某些患者尿液有灰白色沉淀，加酸后沉淀物溶解并产生气泡，应考虑

A．尿酸盐结晶
B．磷酸盐结晶
C．碳酸盐结晶
D．草酸钙结晶
E．磷酸钙结晶

下列公约中，由联合国教科文组织管理的是（）。

A.《专利法条约》

B.《与贸易有关的知识产权协议》

C.《世界版权公约》

D.《北美自由贸易协定》