In a （） boiler the hot gases from the furnace pass through the tubes while the water is on the outside. ["water-tube","fire-tube","exhaust gas","None of the above is true"]
光合产物是以哪种形式从叶绿体转移到细胞质中去的？（）。 ["核酮糖","葡萄糖","蔗糖","磷酸丙糖"]
Before welding in a tank that has carried petroleum products，the tank must be certified by （）. ["the Coast Guard","the ABS","the shipyard fire department","a certified marine chemist"]
制造商可以综合利用代理商、批发商、零售商、赞许经销商等多种途径向只标市场进行分销，其采取的是（）。 ["单渠道模式","双渠道模式","多渠道模式","综合渠道模式"]
Before welding can be done in a tank that has carried petroleum products，a certificate must be obtained from（）. ["the customs","the Register Bureau of shipping","the shipyard fire department","a certified gas chemist"]
什么是目标模式曲线？
