什么是国库现金管理？

平时所说的CD-ROM为52倍速，则它是以（）速度作为光驱的标准速度。

A.120KB/S

B.130KB/S

C.140KB/S

D.150KB/S

1999年10月15日，A公司与B公司签订了一份加工承揽合同。该合同约定：由B公司为A公司制作铝合金门窗1万件，原材料由A公司提供，加工承揽报酬总额为150万元，违约金为报酬总额的10％；A公司应在1999年11月5日前向B公司交付60％的原材料，B公司应在2000年3月1日前完成6000件门窗的加工制作并交货；A公司应在2000年3月5日前交付其余40％的原材料。B公司应在2000年5月20日前完成其余门窗的加工制作并交货。A公司应在收到B公司交付门窗后3日内付清相应款项。

为确保A公司履行付款义务，B公司要求其提供担保，适值D公司委托A公司购买办公用房，D公司为此向A公司提供了盖有D公司公章及法定代表人签字的空白委托书和D公司的合同专用章。A公司遂利用上述空白委托书和合同专用章，将D公司列为该项加工承揽合同的连带保证人，与B公司签订了保证合同。

1999年11月1日，A公司向B公司交付60％的原材料，B公司按约加工制作门窗。2000年2月28日，B公司将制作完成的6000件门窗交付A公司，A公司按报酬总额的60％予以结算。

2000年3月1日，B公司发生重组，加工型材的生产部门分立为C公司。3月5日，A公司既未按加工承揽合同的约定向B公司交付40％的原材料，也未向C公司交付。3月15日，C公司要求A公司继续履行其与B公司签订的加工承揽合同，A公司表示无法继续履行并要求解除合同。C公司遂在数日后向人民法院提起诉讼，要求判令A公司支付违约金并继续履行加工承揽合同，同时要求D公司承担连带责任。

经查明：A公司与B公司签订的加工承揽合同仅有B公司及其法定代表人的签章，而无A公司的签章。

要求：

根据上述内容，分别回答下列问题：

D公司应否承担保证责任？并说明理由。

某青年右面部颞骨被石块击伤后昏迷30分钟，清醒5小时后又转为昏迷，伴右侧瞳孔逐渐散大，左侧肢体瘫痪和生命体征变化，临床诊断首先考虑（）

A.脑内血肿

B.脑挫伤

C.脑水肿

D.急性硬膜下积液

E.急性硬膜外血肿

Motherhood may make women smarter and may help prevent dementia in old age by bathing the brain in protective hormones, US reseachers reported on Thursday.

Tests on rats show that those who raise two or more litters of pups do considerably better in tests of memory and skills than rats who have no babies, and their brains show changes that suggest they may be protected against diseases such as Alzheimer’s. University of Richmond psychology professor Craig Kinsley believes his findings will translate into humans.

"Our research shows that the hormones of pregnancy are protecting the brain, including estrogen, which we know has many neuroprotective effects," Kinsley said.

"It’s rat data but humans are mammals just like these animals are mammals," he added in a telephone interview. "They go through pregnancy and hormonal changes. "

Kinsley said he hoped public health officials and researchers will look to see if having had children protects a woman from Alzheimer’s and other forms of age-related brain decline.

"When people think about pregnancy, they think about what happens to babies and the mother from the neck down," said Kinsley, who presented his findings to the annual meeting of the Society of Neuroscience in Orlando, Florida.

"They do not realize that hormones are washing on the brain. If you look at female animals who have never gone through pregnancy, they act differently toward young. But if she goes through pregnancy, she will sacrifice her life for her infant—that is a great change in her behavior that showed in genetic alterations to the brain. \

What can protect the brain of a woman according to the passage().

A. Estrogen.

B. The hormones of pregnancy.

C. More exercise.

D. Taking care of children.