His two friends, Oberleutnant Fritz Sohler and Oberleutnant Gerhard Schröder, taught "Observer" Helbig to fly and he earned his Luftwaffe Advanced Pilot's Certificate (Erweiterter Luftwaffen-Flugzeugführerschein), also known as 'C'-Certificate, confirming proficiency on multi-engine aircraft.
In the winter of 1940 41, Sayn-Wittgenstein returned to pilot school and took his Luftwaffe Advanced Pilot's Certificate 2 (Erweiterter Luftwaffen-Flugzeugführerschein 2), also known as 'C2'-Certificate, confirming proficiency for blind-flying, a pre-requisite for night duty, and returned to a combat unit in March 1941.
The method was then transferred to and implemented at the regional laboratories of the German federal states responsible for BT screening; the results were confirmed by proficiency testing.
Numerical examples confirm the proficiency of the method.
The validity of the susceptibility data submitted by participating hospitals for VRE and MRSA has previously been confirmed through a proficiency testing program at these laboratories and by confirmatory testing at the ICARE reference laboratory of up to 20 VRE and 20 MRSA isolates from these hospitals (13, 16).
The fact that, in our structural model, L2 linguistic knowledge explained the most variance in L2 listening proficiency confirms that both grammar knowledge and vocabulary knowledge are key factors in determining L2 listening proficiency.
Students may choose one of two options in which to confirm their language proficiency.
The output, combined with the back story, stirred anticipation for his first commercial product, "Str8 Killa" (Decon/ Gibbs Family), an EP that confirms his core proficiency while letting some of the air out of his notoriety.
For the latter, post hoc analyses similarly confirmed a significant effect of proficiency, and mid-level females again used [D] more often than high-level females (p < .05).05
CFA confirmed that the EPE measures three constructs: grammar proficiency, reading proficiency, and listening proficiency.
This was confirmed by an off-line Dutch proficiency test (Dutch lexical decision task) in which accuracy was at chance level.
