已知复数z满足（1+i）•z=-i，则.z的模为______．

如右图所示，已知A元素的最低化合价为-3，它的最高价氧化物含氧56.34%，原子核内中子数比质子数多一个。试完成下列问题：

（1）写出它们的元素符号：

A_________，B_________，C_________，D_________，E_________。

（2）它们的气态氢化物稳定性最弱的是_________。

（3）A、B、C三元素最高价氧化物对应水化物的酸性由强到弱的顺序是_________。

船用电缆、电线的绝缘材料（）阻燃性；防护材料（）阻燃性。

A．具有/具有

B．具有/不具有

C．不具有/具有

D．不具有/不具有

职工李某2012年3月1日被招入某公司时，公司忘了与其订立劳动合同，李某知道公司如果不与其订立书面劳动合同，依法需要向其支付双倍工资，因此一直不动声色，直至公司对劳动合同进行普查时，才发现与李漏签了劳动合同，于是，公司提出要与李某补签书面劳动合同，但李某要求公司先支付其另一倍工资，否则不同意补签书面劳动合同。公司表示，如果李某不同意补签书面劳动合同，公司将随时与李某终止劳动关系，随后，因李某不同意订立书面劳动合同，公司向李某送达了终止劳动关系的书面通知，李某收到书面通知后，要求公司给予其经济补偿，但公司予以拒绝，双方因此发生了争议。

关于李某要求公司支付两倍工资的说法，正确的是（）

A.公司应自2012年3月1日起向李某支付两倍工资

B.公司是否与李某订立书面劳动合同，都无须向李某支付两倍工资

C.只要李某提出要求，公司就应向李某支付两倍工资

D.公司应当自2012年4月1日起向李某支付两倍工资

RPG组件（1A7119）内的莫尔斯码产生器每30S产生（）组莫尔斯码。

A.3

B.1

C.4

D.5

Like other men of vision (有识之士) , Maceo had no time for racism, for the false idea that one race of men is better or worse than any other. Some of the whites of Cuba disagreed with him. They were Spanish settlers who thought that white was going to be better than black even in an independent Cuba.
One day Maceo was approached by a Spanish Cuban who suggested that the regiments of independence army should be divided into whites and nonwhites. Maceo made him a reply which became famous in Cuba. "If you were not white," Maceo said to this man, "I would have you shot on the spot. But I do not wish to be accused of being a racialist as you are, and so I let you go, but with the warning that I shall not be so patient another time. The revolution has no color.\

All the people in Cuba are Spanish settlers.
A. Right.B. Wrong. C. Doesn’t say.