桥涵顶进施工采用多种方法，如：一次顶入法、对顶法、解体顶进法、开槽顶入法等，常用施工方法为一次顶入法。
Construction of bridge and culvert can be conducted by many methods, such as primary jack-in method, across jack-in method, split jack-in method and slot jack-in method.
方法：采用外标法顶空自动进样，在非极性弹性毛细管柱上进行分离，效果良好。
Methods: auto - injection using external standard headspace method, which make the component can be separated at the nonpolar elastic capillary column, the result is good.
提出用大口径毛细管顶空进样气相色谱法对聚氯乙烯树脂中十亿分之一级残留氯乙烯含量的测量方法。
The test method for determining residual vinyl chloride monomer content in parts per billion level in PVC resin by capillary column gas chromatography headspace technique is suggested.
新管幕工法是我国引进的一种新型地下结构暗挖工法，该工法以沿结构边线顶进大直径钢管为基础，逐步形成大断面地下结构。
The underground structure gradually forms by compressing a serious of great diameter steel pipes into the ground used as a foundation along the edge of the structure.
方法用DM- 624毛细管气相色谱柱，顶空进样法，FID检测器，以甲醇为内标进行测定。
METHODS the samples were injected into DM-624 capillary column by headspace sampler and analysed with FID detector using methanol as the internal standard.
方法采用HP- 624毛细管柱，顶空进样法，FID检测器，以正丙醇为内标进行测定。
METHODS The samples were injected into HP-624 capillary column by headspace sampling and analyzed by using n-propanol as internal standard with FID detector.
方法：采用外标法顶空自动进样，在非极性弹性毛细管柱上进行分离，效果良好。
Methods: Use Head- space automatic injection method, isolating with the nonpolarity flexibility capillary column, calculating with external method.
方法：用 HP-5毛细管气相色谱柱，顶空进样，FID检测器，以标准溶液加入法进行计算。
Methods:The samples were injected into HP-5 capillary colnmn by head- space sampler and analysed with FID detector with standard addition method.
结果 采用顶空进样技术，可鉴定出侧柏叶中29个挥发性化学成分；采用水蒸气蒸馏法可鉴定出34个挥发性化学成分；
RESULTS By GC-MS, 29 volatile compounds in Platycladi Cacumen treated with head-space injection were identified, while 34 volatile compounds identified with steam distillation;
结果 采用顶空进样技术，可鉴定出侧柏叶中29个挥发性化学成分；采用水蒸气蒸馏法可鉴定出34个挥发性化学成分；
RESULTS By GC-MS, 29 volatile compounds in Platycladi Cacumen treated with head-space injection were identified, while 34 volatile compounds identified with steam distillation;
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