关于尿胆原代谢的错误叙述是（） A.结合胆红素排入肠道后被转化为尿胆原 B.尿胆原在

灰料过多和过少对电除尘有什么危害？

肾动态显像中下列哪个因素不影响GFR的测定（）

A.肾脏本身的大小

B.左右肾感兴趣区的大小

C.肾深度计算

D.受检者身高、体重

E.本底感兴趣区的位置

The blue of the sea is caused by the scattering of sunlight by tiny particles suspended in the water. Blue light, being of short wavelength, is scattered more efficiently than light of longer wavelengths. Although waters of the open ocean are commonly some shade of blue, green water is commonly seen near coasts, especially in tropical or subtropical regions. This is caused by yellow pigments being mixed with blue water. Phytoplankton are one source of the yellow pigment. Other microscopic plants may color the water brown or brownish-red. Near the shore, silt or sediment in suspension can give water a brownish hue. Outflow of large rivers can often be observed many miles offshore by the coloration of suspended soil particles.Marine phytoplankton (Greek for "plant wanderers") are microscopic single-celled plants that include diatoms, dinoflagellates, coccolithophorids, green algae, and blue-green algae, among others. The growth of these organisms, which photosynthesize light, depends on a delicate balance of nutrient enrichment via vertical mixing, which is often limited by the availability of nitrogen and light. Diatoms are one-celled plants with patterned glass coverings. Each glass, or silicon dioxide box, is ornamented with species-specific designs, pits, and perforations making them popular with microscopists and, more recently, electron scanning microscopists.

The main idea of this passage is that________.

A．light causes sea color

B．sea coloration is varied because of a combination of length of light waves and microscopic plant life and silt

C．microscopic plant life causes sea color

D．water composition causes sea color

“成功大师”拿破仑·希尔说：“人与人之间只是很小的差异，但这种很小的差异却可以造成巨大的差异。很小的差异即积极的心态或消极的心态，巨大的差异就是成功或失败。”这启示我们（）

A.要坚持适度原则

B.部分在一定条件下对整体起决定作用

C.要充分重视意识的能动作用

D.发挥主观能动性要以尊重客观规律为基础

制造业PMI以制造业法人企业为抽样单位，抽样方法采用分层PPS抽样。( )