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【单选题】
关于建设工程见证取样的说法，正确的是（ ）。A.
施工人员对工程涉及机构安全的试块、试件和材料，应当在建设单位或工程监理单位监督下现场取样
B.
设计结构安全的试块、试件和材料见证取样和送检比例不得低于有关技术标准中规定应取样的50%
C.
墙体保温材料必须实施见证取样和送检
D.
见证人员施工企业中具备施工试验知识的专业技术人员担当
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举一反三
【单选题】The doctor will not permit mother up __________ her leg is better.
A.
if
B.
until
C.
when
D.
unless
【单选题】The doctor will not perform. the operation______it is absolutely necessary.
A.
if
B.
unless
C.
when
D.
as
【单选题】The doctor will not perform the operation ___ it is absolutely necessary.
A.
when
B.
if
C.
for
D.
unless
【单选题】The doctor will not permit him _____ until his foot is better.
A.
walk
B.
to walk
C.
walking
D.
walked
【单选题】The doctor will not perform. the operation ______ it is absolutely necessary.
A.
so
B.
if
C.
for
D.
unless
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