Water and glass are ()。
A.color
B.colorless
C.colorful
D.colors
A.color
B.colorless
C.colorful
D.colors
第3题
A.PTFE
B.mixture of resin
C.glass fiber in woven form
D.glass fiber in mat form
第4题
walks of modern buildings.
A.can
B.may
C.should
D.must
第5题
A.for
B.from
C.in
D.over
第7题
A.on, for
B.at, for
C.in, to
D.on, to
第8题
A.铒玻璃激光(Er:Glass,1550nm)
B.掺钕钇铝石榴石激光(Nd:YAG,1320nm)
C.Nd:YAG,1440nm
D.Er:Fiber激光(1410nm)
E.铒激光(Er:YAG2940nm)
第9题
B、Seniors, superiors, and guests are served first.
C、To show respect and humility, keep your liquor glass lower than others’ when cheering.
D、The host usually makes the first toast.
第10题
A.liquid
B.vapor
C.water drop
D.drip