necessitate的例句（necessitate在句子中的用法）

• This may necessitate transmitting and receiving signals in different frequency bands. 这可能使在不同频段内发射及接收信号成为必要的.
• To map 100 mutants by this method would necessitate nearly 5,000 crosses. 用这种方法来绘制100个突变型的遗传图就要做5000个杂交.
• The occurrence of peptic ulcer in some pa - tients with hiatal hernia may necessitate considerationof both diagnosis. 对一些裂孔病患者,出现消化性溃疡时,须考虑两种疾患的诊断.
• The agglomeration and sintering of fine particles can necessitate a lowering in temperature of operation. 由于微粒易于聚集和烧结,不得不降低操作温度.