【单选题】下列不属于二氧化碳通过植物给人类造成的危害的一项是( )。
【判断题】Iron is believed to facilitate weight loss for females.
【简答题】将生长状态一致的某种植物幼苗分成甲、乙两组,分别移入适宜的营养液中在光下培养,并给甲组的营养液适时通入空气,乙组不进行通气处理。一定时间后测得甲组的根对 a 离子的吸收速率远大于乙组的。关于这一实验现象,下列说法错误的是( ) A. 给营养液通入空气有利于该植物的生长 B. 根细胞对 a 离子的吸收过程属于自由扩散 C. 根细胞对 a 离子的吸收过程有能量的消耗 D. 根细胞的有氧呼吸有利于根对...
【单选题】在分析整流电路工作时,认为晶闸管(开关器件)为( )。
【简答题】翻译句子: This has shown that our planet has a core of heavy material with a density of 8. Two metals, iron and nickel, have densities a little below and above 8 respectively, and the core is believed to ...
【单选题】下列不属于植物生长所需要的营养的是( )
【单选题】植物生长离不开“营养”元素,合理使用化肥能促进农业增产,下列化肥中属于复合肥的是 [ ]
【单选题】Which of the following statement is NOT TRUE according to the passage?
A.
The Moon was born after a giant collision between the young Earth and another planet.
B.
The Moon rocks had a higher ratio of iron 57 to iron 54 isotopes than the Earth rocks.
C.
The Moon and the Earth have almost the same portion of iron.
D.
This catastrophic collision would have released much more energy than the impact believed to have wiped out the dinosaurs.
【简答题】柏油马路起伏不止,马路像是贴在海浪上。我走在这条山区公路上,我像一条船。这年我十八岁,我下巴上那几根黄色的胡须迎风飘飘,那是第一批来这里定居的胡须,所以我格外珍重它们 。出自 《 》
【单选题】下列属于战略相持阶段国民党正面战场的战役是: ( )