税收征收的依据是( )。 A．合同 B．规章 C．协议 D．法律

在﹣2，+3，﹣6这三个数中，任意两数之和的最小值是[ ]

A．1

B．﹣3

C．﹣8

D．﹣9

设N_A表示阿伏加德罗常数值，下列叙述正确的是（　　）

A．N_A个氧气分子和N_A个氢气分子的质量比为16：1

B．标准状况下，22.4LH₂O含有的分子数为N_A

C．11.2L 氯气中含有的原子数为N_A个

D．2L 1mol/L Na₂SO₄溶液中Na⁺离子数为2N_A个

Gandhi, an Indian national hero, (31)         ______(honor) as the father of the Indian nation. He has been respected and beloved by the Indians.

He was born in India in 1869. Following the local custom, he got (32)    _____     (marry) at the age of 13. In 1888 he sailed to England, (33)               he studied law for three years and then became a (34)               (law). On his return to India, he was sent to South Africa to work on a law case.

In South Africa he (35)         ______ (surprise) found that the problem of racial discrimination was serious. There he formed an (36)       ______(organize) and started a magazine to fight for equal rights.

Gandhi returned to India in 1915, when India was controlled by the British.  He led the Indians to fight for an end to the British rule and (37)        ______ (depend) for his country. In the political movement many Indians, ____________ (38)         (include) Gandhi, were put in prison. (39)       ______, the struggles never stopped. The British  government  had  to  give  in  and India won its independence in 1947. (40)    ______     (fortunate)，Gandhi was shot by an Indian who opposed his views and died on January 30th, 1948.

急性白血病的化疗原则，下列哪一项是不正确的（）

A.联合化疗可采用不同药理作用和不同毒性的药物

B.联合化疗只能采用细胞周期特异性药物

C.同步化疗是利用药物的作用，使较多白血病细胞同时进入同一细胞增殖周期

D.诱导缓解宜采用大剂量、间歇药物治疗

E.巩固维持宜长期进行，定期强化治疗

烟道内发生再燃烧时，应彻底通风，排除烟道中沉积的可燃物，然后再点火。