生活中常遇到“碘盐”“高钙牛奶”“铁强化酱油”等商品,这里的“碘、钙、铁”是指

题型:选择题

问题:

生活中常遇到“碘盐”“高钙牛奶”“铁强化酱油”等商品,这里的“碘、钙、铁”是指

A.元素

B.原子

C.分子

D.单质

考点:化学元素和人体健康食品安全
题型:选择题

设f(x)是定义在R上的奇函数,当x≤0时,f(x)=2x2-x,则f(1)=(    )。

题型:选择题

6502电气集中在12线上串接QJJ第二组接点其作用是()。

A.防止提前解锁

B.防止道岔中途转换

C.防止迂回电流

D.保证供电

题型:选择题

明代的()被誉为“吴中四名家”。

A.苏轼、黄庭坚、米芾、蔡襄

B.李唐、刘松年、马远、夏圭

C.赵孟頫、吴镇、黄公望、王蒙

D.祝允明、文徵明、陈道复、王宠

题型:选择题

水泥窑用固体燃料的分类。

题型:选择题

With hundreds of millions of electronic (161) taking place daily, businesses and organizations have a p incentive to protect the (162) of the data exchanged in this manner, and to positively ensure the (163) of those involved in the transactions. This has led to an industry-wide quest for better, more secure methods for controlling IT operations, and for deploying p security mechanisms deeply and broadly throughout networked infrastructures and client devices. One of the more successful concepts to engage the imaginations of the security community has been the development of standards-based security (164 ) that can be incorporated in the hardware design of client computers. The principle of encapsulating core security capabilities in (165 ) and integrating security provisions at the deepest levels of the machine operation has significant benefits for both users and those responsible for securing IT operations.

(164)是()

A.appliances

B.chips

C.tools

D.means

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