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【单选题】
土壤的可交换性阳离子有两类,一类是致酸离子;另一类是盐基离子,下面离子中属于致酸离子是 。 3+A.
H + 、Ca 2+
B.
H + 、Mg2+ 2+
C.
Na+ + 、AI3+
D.
H+ + 、AI3+ 3+
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【单选题】The vehicle insurers say the lorries are complete ___ .
A.
out of use
B.
useless
C.
write-offs
D.
write out
【简答题】To write out the human genome on paper would require ______ books.
【简答题】You should cut out unnecessary words when you write an article.
【单选题】I’ll ()my lawyer to write out the agreement.
A.
inform
B.
notify
C.
announce
D.
report
【简答题】Write the hydrogen isotopes symbols and Chinese name, and points out that the hydrogen bonding characteristic.
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