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【单选题】
关于OTU，说法错误的是：A.
OTU的中文翻译是可操作分类单元。
B.
OTU是设定一个阈值之后归并的一类序列。
C.
97%是目前比较常用的阈值。
D.
OTU真实反映了一个实际物种。
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【单选题】______ work has been done to improve people' s living standard.
A.
Many
B.
A great many
C.
A large number of
D.
A great deal of
【单选题】Every means _____tried. All the means _______ tried. A.has been/have been B.has been/has been C.have been/have been
A.
has been/have been
B.
has been/has been
C.
have been/have been
D.
have been/has been
【单选题】Mr Li ____ England. He ____ London for two weeks.
A.
has been to; has been to
B.
has gone to; has been in
C.
has been to; has been in
D.
has gone to; has been to
【单选题】Your computer has the following hardware configuration: 512 MB of RAM 10-GB hard disk 933-MHz processor -MB video adapter. You want to install Microsoft Windows Vista on this computer. You need to i...
A.
A
B.
B
C.
C
D.
D
【单选题】The sick cured and the lost found.
A.
have;have
B.
has;has
C.
have been;have been
D.
has been;has been
【单选题】以下关于旋光性的说法不正确的是( )。
A.
含有手性碳原子的物质都具有旋光性。
B.
物质的旋光性分为左旋和右旋。
C.
物质的旋光能力用旋光度表示。
D.
旋光度为0的溶液不含具有旋光性的物质。
【单选题】按照《公约》的规定，一项确定的发盘应写明（ ）
A.
货物的名称、数量、包装、价格
B.
交货期和支付方式
C.
品名、数量、价格或规定如何确定数量和价格
D.
必须表明品名、价格、装运期
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